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On Sale 20%
On Sale 20%(OVERSTOCK) (Expires 11/2025) (HI781-25) Marine Low Range Nitrate Checker Reagents (25 Tests) - Hanna Instruments
Hanna Instruments$16.00$12.80The HI781-25 are high-quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their HI781 Marine Nitrate Low Range Colorimeter. These reagents follow a colorimetric method in which the reaction between... -
On Sale 12%
On Sale 12%Reef Foundation A Dry - Calcium (CA) (1 KG) Powder - Red Sea
Red Sea$31.99$28.15Calcium+ Supplement Calcium and Strontium complex for balanced formation of the coral skeleton It’s all in the balance Calcium, Magnesium, Strontium and Carbonate are the basic foundation elements of coral skeletons.All of these elements... -
On Sale 20%
On Sale 20%Hanna Master Reef Beginner Kit (772 Alk, 758 Calcium, 783 Magnesium, 782 HR Nitrate, 774 ULR Phosphate) Checker HC (Saltwater) - Hanna Instruments
Hanna Instruments$339.95$271.96772 CheckerThe HI772 Checker®HC (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure alkalinity in degrees of calcium hardness, commonly abbreviated as dKH. Critical to marine environments, alkalinity not only provides... -
On Sale 12%
On Sale 12%Coral Pro Sea Salt Mix Red BOX (Makes 160 Gallons) - Red Sea
Red Sea$79.99$70.39Red Sea’s Coral Pro Salt contains biologically balanced, elevated levels of the foundation elements (Calcium, Magnesium, Carbonates) necessary for sustainable, accelerated coral growth. Coral Pro Salt is ideal for reef aquariums, in particular for... -
On Sale 12%
On Sale 12%Reef Foundation A - Calcium (CA) (500 ml) Liquid - Red Sea
Red Sea$19.99$17.59Calcium+ Supplement Calcium and Strontium complex for balanced formation of the coral skeleton It’s all in the balance Calcium, Magnesium, Strontium and Carbonate are the basic foundation elements of coral skeletons.All of these elements... -
Reef Master Test Kit (Calcium, KH, Phosphate, Nitrate) - API
API$34.98Reef Master Test Kit - To maintain and grow healthy corals, the correct balance of calcium and carbonates is essential, as are low levels of phosphate and nitrate. This kit provides highly accurate testing for each of these critical... -
On Sale 15%
On Sale 15%Reef Fusion "2" Two Part Calcium/Buffer System (4 L) - Seachem
Seachem$32.33$27.48Reef Fusion 1™ and Reef Fusion 2™ are the foundation of a system formulated to provide the essentials for the reef aquarium. Reef Fusion 1™ provides calcium, while Reef Fusion 2™ provides alkalinity. When used together, the Reef... -
On Sale 20%
On Sale 20%HI7007L 7.01 pH Calibration Buffer Solution, (500 ml) Bottle - Hanna Instruments
Hanna Instruments$19.99$15.99HI7007 is a premium quality pH 7.01 technical calibration buffer that is NIST traceable and supplied with a Certificate of Analysis. Hanna calibration buffers have the lot number and expiration date clearly marked on the label and are air tight with a... -
On Sale 15%
On Sale 15%PhosGuard Phosphate Remover (500 mL) - Seachem
Seachem$12.26$10.42PhosGuard is spherical. Its shape allows for maximum water flow through the media. Granular phosphate removers can become compacted, dramatically limiting their capacity to remove phosphate. If the media can’t come into contact with the water, it... -
On Sale 15%
On Sale 15%Kalkwasser Powder Calcium Hydroxide (3.5 lbs) - ESV
ESV$27.99$23.79Calcium hydroxide is used to prepare limewater (kalkwasser) solutions that will maintain calcium concentrations at natural seawater levels. Kalkwasser solutions maintain calcium directly and carbonate alkalinity indirectly. However, its capacity to... -
On Sale 20%
On Sale 20%Hanna Full Range Test Kit (772, 758, 713, 781, 780, HI98319) Saltwater - Hanna Instruments
Hanna Instruments$429.94$343.95772 Checker - Alkalinity in dKHThe HI772 Checker® HC (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure alkalinity in degrees of calcium hardness, commonly abbreviated as dKH. Critical to marine environments,... -
On Sale 20%
On Sale 20%pHep®+ Waterproof Pocket pH Tester with 0.01 pH Resolution (HI98108) - Hanna Instruments
Hanna Instruments$69.99$55.99The HI98108 pHep+® pH tester provides high accuracy measurements in a rugged pocket-sized design. This ph tester features an exposed temperature sensor for automatic temperature compensated readings. The simple, two-button operation and large... -
On Sale 15%
On Sale 15%Prime (250 mL) - Seachem
Seachem$9.64$8.19Prime® is the complete and concentrated conditioner for both fresh and saltwater. Prime® removes chlorine, chloramine and detoxifies ammonia. Prime® converts ammonia into a safe, non-toxic form that is readily removed by the tank’s... -
On Sale 15%
On Sale 15%C-Balance 2 Part Supplement (2 Gallon Set) 2x - 1 Gallon Bottles - Two Little Fishies
Two Little Fishies$47.51$40.38C-Balance® - Two Part Balanced Ionic Supplement of Calcium and Buffer for Marine Aquariums Manufactured by Two Little Fishies This two-part calcium and alkalinity maintenance system adjusts calcium, magnesium, and strontium ions to natural... -
KH Carbonate Hardness Test Kit - API
API$8.98KH Carbonate Hardness Test Kit The API® KH Carbonate Hardness Test Kit tests fresh or saltwater aquariums for carbonate hardness (KH), and helps monitor water quality and prevent invisible water problems that can be harmful to fish and plants... -
On Sale 15%
On Sale 15%Purple Up (16 oz) - Caribsea
Caribsea$18.49$15.72PurpleUp™ - uses a unique dual method approach to coralline algae acceleration. This approach is so unique that PurpleUp has been awarded a US patent (US patent No. 7,565,883). It contains ionic calcium; which immediately raises dissolved calcium... -
On Sale 15%
On Sale 15%CoralAmino Free Form Amino Acid Supplement (60 ml) - Brightwell
Brightwell Aquatics$27.57$23.43Free-Form Coral Amino Complex for all Corals & Their Allies Overview Complex of free-form amino acids in the same ratios found within tissues of stony corals. Beneficial to all corals (stony and soft), as well as solitary and colonial polyps... -
On Sale 15%
On Sale 15%NeoNitro (2 L) - Brightwell
Brightwell Aquatics$25.51$21.68Balanced Nitrogen Source for Nitrogen-Limited, Low-Nutrient Reef Aquaria Overview Used in conjunction with MICROBACTER7 and REEF BIOFUEL or KATALYST, enablesnatural phosphorus uptake to take place in systems with inadequate nitrogen content,lowering... -
On Sale 15%
On Sale 15%CoralAmino Free Form Amino Acid Supplement (30 ml) - Brightwell
Brightwell Aquatics$17.73$15.07Free-Form Coral Amino Complex for all Corals & Their Allies Overview Complex of free-form amino acids in the same ratios found within tissues of stony corals. Beneficial to all corals (stony and soft), as well as solitary and colonial polyps... -
On Sale 15%
On Sale 15%Ammonia & pH Alert Combo 2 Pack (1 Year) Freshwater - Seachem
Seachem$16.22$13.79No strips, no tests, just constant readings. Now Ammonia Alert and pH Alert come together! Ammonia Alert and pH Alert employ Seachem Sensor Technology; a sensor changes color reversibly to alert you to shifts in ammonia levels and shifts in pH... -
On Sale 15%
On Sale 15%LED Lighted Salinity Refractometer
All Misc Brands$34.95$29.71Lighted Refractometer uniquely design incorporates LED technology to illuminate the scale without the need of ambient light. It is designed for testing the concentration of salt water and brine and used for quality control in research and clinical... -
On Sale 15%
On Sale 15%Reef Fusion "2" Two Part Calcium/Buffer System (2 L) - Seachem
Seachem$21.44$18.22Reef Fusion 1™ and Reef Fusion 2™ are the foundation of a system formulated to provide the essentials for the reef aquarium. Reef Fusion 1™ provides calcium, while Reef Fusion 2™ provides alkalinity. When used together, the Reef... -
On Sale 20%
On Sale 20%Bacto Reef Balls (250 ml) - Live Reef Bacteria - Fauna Marin
Fauna Marin$29.95$23.96Millions of live reef-bacteria and enzymes in depot balls for easy dosing. BACTO REEF BALLS EFFECT: Crystal clear & healthy water, nutrition control and easy reduction of ammonia, nitrite, nitrate and phosphates. Cleans up organic waste and... -
On Sale 12%
On Sale 12%Ammonia Marine Test Kit - Red Sea
Red Sea$23.99$21.11Accurately measure the ammonia (NH3/NH4) in your saltwater aquarium with the advanced colorimetric test from Red Sea. 100 NH3/NH4 tests Accuracy: .2 ppm Range: 0-2 ppm Test Type: Colorimetric -
On Sale 15%
On Sale 15%(Germany) Syn-Biotic Sea Salt (200 Gallon) - Tropic Marin
Tropic Marin$126.53$107.55Tropic Marin® Syn-Biotic Sea Salt contains probiotic bacteria for fish and shrimp and special prebiotic bacteria food to promote probiotic bacterial growth and to create low-nutrient conditions in the aquarium for LPS and SPS corals. The term... -
On Sale 20%
On Sale 20%HI70436M Deionized Water (230 ml) - Hanna
Hanna Instruments$18.99$15.19Deionized water for your research needs. Air-tight seal to ensure the quality of the solution. Marked with lot number and expiration date. -
On Sale 15%
On Sale 15%Flux RX up to 200g (4000 mg) Fluconazole - Blue Life USA
Blue Life USA$36.46$30.99Flux Rx is simple and effective with levels easily achieved and maintained quickly for effectiveness when Bryopsis or Green Hair Algae are present. How to prepare product: Turn off skimmer and discontinue using activated carbon and phosphate... -
On Sale 30%
On Sale 30%3 Pack Triton ICP-OES Water Test w/Prepaid Shipping Label - Triton Labs
Triton$141.00$98.70Now Includes a Prepaid USPS First Class Shipping Label + Testing is Now Done in the USA! The results of this test provide you with the most detailed analysis of marine aquarium water you've ever seen, enabling you to understand exactly what's missing,... -
On Sale 12%
On Sale 12%Trace Colors PRO - Multi Test Kit Iodine/Potassium/Iron - Red Sea
Red Sea$84.99$74.79It’s all in the balance Red Sea’s TRACE COLORS PRO Multi Test Kit includes advanced tests for the high accuracy measurement of Iodine, Potassium and Iron. All of these elements are associated with many biological... -
On Sale 12%
On Sale 12%Reef Foundation A - Calcium (CA) - (5 Liter / 1.32 Gal) - Red Sea
Red Sea$109.00$95.92Calcium+ Supplement Calcium and Strontium complex for balanced formation of the coral skeleton It’s all in the balance Calcium, Magnesium, Strontium and Carbonate are the basic foundation elements of coral skeletons.All of these elements... -
On Sale 15%
On Sale 15%Nitrate + (1000 ml) - NYOS
NYOS$14.99$12.74Control of nutrients made easy. Only raises the nitrate value No undesirable additives High degree of purity Nyos® NITRATE+ and PHOSPHATE+ allows you to raise nitrate and phosphate levels quickly, easily and safely. The correct nitrate and... -
On Sale 15%
On Sale 15%Reef Fusion "1" Two Part Calcium/Buffer System (4 L) - Seachem
Seachem$32.33$27.48Reef Fusion 1™ and Reef Fusion 2™ are the foundation of a system formulated to provide the essentials for the reef aquarium. Reef Fusion 1™ provides calcium, while Reef Fusion 2™ provides alkalinity. When used together, the Reef... -
On Sale 20%
On Sale 20%Sea Salt (25 kg - 200 Gallons) Box - Aquaforest
Aquaforest$82.39$65.91Synthetic marine salt for aquariums with fish and less delicate corals and invertebrates. When setting up new aquariums it is recommended that the first animals are placed no sooner than 10-14 days after filling the aquarium. After dissolving the salt,... -
On Sale 15%
On Sale 15%B-Ionic Magnesium (32 oz) - ESV
ESV$22.99$19.54Through the chemical process known as "ion-pairing" magnesium ion concentration influences the saturation point for calcium carbonate in solution. In general the further the magnesium concentration drops from natural seawater levels (1350 ppm) the more... -
On Sale 15%
On Sale 15%One - Mg, KH, Ca Supplement (500 ml) - Polyplab
PolypLab$19.99$16.99What is PolypLab One? PolypLab One is engineered from two forms of acetate and hydroxide salts. When dosed, the calcium magnesium ions are freely available for uptake by corals, clams, and many other reef organisms. The acetate ions are metabolized by... -
On Sale 15%
On Sale 15%Reef Advantage Magnesium (1.2 kg) - Seachem
Seachem$14.18$12.05Severely depleted levels of magnesium (below 800 mg/L) can cause depressed pH levels and an inability to maintain proper magnesium levels. The most frequent causes of magnesium deficiency are use of kalkwasser, frequent overdosing of a carbonate... -
Reef BluePrint Isol8:F - Fluoride (60 mL) - Captiv8 Aquaculture
Captiv8 Aquaculture$11.99Parameter Fluoride Value 10,000 ppm Characteristics Provides fluoride; application thereof in conjunction with weekly ICP analysis to guide dosing rates typically yields deep intensification of blue pigmentation in... -
On Sale 20%
On Sale 20%Glass Cuvette Cleaning Solution (230 ml) HI93703-50 - Hanna Instruments
Hanna Instruments$34.99$27.99The glass cuvette is an important component of the optical system in all colorimetric and turbidimetric measurements. Light reaches the sample by first passing through the cuvette glass. Based on the sample, the light is absorbed, transmitted, or... -
On Sale 15%
On Sale 15%ReMag Magnesium Media for Calcium Reactors (2.2 lbs) - Two Little Fishies
Two Little Fishies$21.41$18.20ReMag is a magnesium-rich natural stone sized to blend well with ReBorn and other calcium carbonate media for use in calcium reactors. ReMag makes maintaining the magnesium level in your reef a no-brainer. Simply use ReMag in a calcium reactor according... -
On Sale 15%
On Sale 15%Prime (2L) - Seachem
Seachem$57.46$48.84Prime® is the complete and concentrated conditioner for both fresh and saltwater. Prime® removes chlorine, chloramine and detoxifies ammonia. Prime® converts ammonia into a safe, non-toxic form that is readily removed by the tank’s...