Marine Aquarium Additives & Dosing
Maintain a healthy, thriving reef aquarium with our specialist range of marine aquarium additives, reef supplements and dosing solutions at Rock ’N’ Critters.
From essential calcium, magnesium and alkalinity (KH) supplements to individual trace elements, amino acids and nutrient additives, our carefully selected products help you maintain balanced seawater chemistry and support the needs of your corals and other marine organisms.
Explore trusted reef aquarium brands including Fauna Marin, Red Sea, Aquaforest and Brightwell Aquatics, with solutions suitable for everything from small mixed reefs to established SPS-dominated aquariums.
Whether you're maintaining everyday calcium and KH levels or correcting a specific deficiency identified through water testing, you'll find quality supplements to help keep your reef aquarium stable.
Not sure which additive your aquarium needs? Our experienced marine aquatics team is always happy to help you choose the right products.
Choosing the Right Marine Aquarium Additives
Maintaining stable water chemistry is essential for a successful reef aquarium. As corals grow, they consume important elements from the surrounding seawater, making regular testing and appropriate supplementation an important part of reef keeping.
At Rock ’N’ Critters, we stock a carefully selected range of marine aquarium additives from leading manufacturers, helping you maintain balanced conditions for SPS corals, LPS corals, soft corals and other reef inhabitants.
Calcium, Magnesium & Alkalinity
Calcium, magnesium and alkalinity (KH) are fundamental to maintaining a stable reef aquarium.
Calcium is essential for coral skeletal development, while alkalinity provides the carbonate and bicarbonate needed for calcification and helps buffer aquarium pH. Magnesium supports seawater chemistry by helping reduce unwanted calcium carbonate precipitation.
Our range includes convenient ready-to-use liquid supplements alongside powdered Balling Light products for aquarists who prefer preparing their own dosing solutions.
Trace Element Supplements
Trace elements occur naturally in seawater and are involved in numerous biological processes.
Our extensive Fauna Marin Elementals range allows individual elements to be supplemented when testing identifies a genuine requirement.
From iodine, iron and manganese to specialist supplements such as zinc, selenium and molybdenum, these concentrated solutions offer precise control over individual elements.
Because excessive supplementation can be harmful, we recommend appropriate testing and careful dosing rather than adding trace elements unnecessarily.
Nutrient Management
Healthy reef aquariums require balanced nutrients as well as stable mineral concentrations.
Although excessive phosphate can contribute to aquarium problems, phosphate is also an essential nutrient. Specialist products such as Fauna Marin Elementals P allow controlled supplementation when phosphate concentrations become too low.
Regular phosphate and nitrate testing helps determine whether nutrient adjustments are necessary.
Balling Light & Automated Dosing
For reef aquariums with significant calcium and alkalinity consumption, the Fauna Marin Balling Light system offers a structured approach to replenishing essential elements.
Our range includes individual Balling Light salts, trace element concentrates and complete starter sets.
For greater convenience, automatic dosing pumps can deliver accurately measured quantities throughout the day, helping maintain consistent aquarium conditions.
Test Before You Dose
Every reef aquarium is different. Supplement requirements depend on factors including aquarium size, coral stocking, growth rates and regular water changes.
We recommend monitoring calcium, magnesium, alkalinity and nutrients using reliable marine aquarium test kits.
For more detailed trace element assessment, laboratory ICP water analysis can help identify deficiencies and guide targeted supplementation.