Aquarium Reactors
Discover our range of high-quality aquarium reactors designed to improve water quality, manage nutrients and maintain essential water chemistry in marine and reef aquariums. At Rock ’N’ Critters, we stock trusted brands including Deltec, D-D, TMC and Tunze, offering solutions for everything from phosphate and nitrate reduction to calcium supplementation and natural macroalgae filtration.
Whether you're looking for a fluidised media reactor, calcium reactor, biopellet reactor or Kalkwasser stirrer, our carefully selected range provides reliable filtration and supplementation options for aquariums of all sizes.
Explore our aquarium reactors below and find the ideal solution for your reef system:
Aquarium Reactors – Effective Filtration & Water Chemistry Management
Aquarium reactors provide specialised filtration and supplementation to help maintain a healthy, stable aquatic environment. From reducing unwanted nutrients to replenishing essential minerals, the right reactor can make aquarium maintenance more efficient while supporting the long-term health of fish, corals and other marine life.
At Rock ’N’ Critters, we offer a carefully selected range of marine aquarium reactors from leading manufacturers, including Deltec, D-D, Tropical Marine Centre and Tunze.
Different Types of Aquarium Reactors
Phosphate & Fluidised Media Reactors
Fluidised media reactors direct aquarium water through specialist filtration media, improving contact and helping maximise effectiveness. They are particularly useful for phosphate removers such as ROWAphos and activated carbon, supporting nutrient management and clearer aquarium water.
Nitrate & Biopellet Reactors
Nitrate reactors help control excessive nitrate through biological filtration. Biopellet reactors encourage beneficial bacterial growth, while specialist denitrification reactors create conditions that allow bacteria to convert nitrate into nitrogen gas.
Calcium Reactors
Calcium reactors provide continuous calcium and alkalinity supplementation by dissolving calcium-rich media using CO₂. They are particularly beneficial for established reef aquariums containing growing SPS and LPS corals with high mineral demands.
Macroalgae Reactors
Macroalgae reactors offer a natural method of nutrient export by cultivating beneficial algae such as Chaetomorpha. As the algae grows, it absorbs nitrate and phosphate, which are removed from the system through regular harvesting.
Kalkwasser Stirrers
Kalkwasser stirrers prepare calcium-rich limewater for controlled supplementation, helping maintain calcium, alkalinity and aquarium pH. They can be particularly useful alongside calcium reactors or suitable automatic top-up systems.
Choosing the Right Aquarium Reactor
The best reactor depends on your aquarium size, livestock, filtration system and water chemistry requirements.
For phosphate control, a fluidised media reactor may be sufficient, while aquariums with persistent nitrate problems could benefit from dedicated biological filtration. Established coral reefs with increasing calcium and alkalinity consumption may require a calcium reactor or Kalkwasser system.
Regular water testing remains essential, even when using automated filtration and supplementation equipment.
Expert Advice from Rock ’N’ Critters
With decades of marine aquarium experience, our team can help you select suitable filtration equipment for your aquarium.
Whether you're upgrading an existing reef system or planning a new installation, we're happy to discuss reactor selection, compatible filtration media and installation requirements.
Explore our aquarium reactors online or visit Rock ’N’ Critters in Barry, South Wales, for friendly, knowledgeable advice.