Seachem Laboratories Reef Builder Biological Enhancer, 1.3 lb

Keeping a thriving reef means staying on top of your water chemistry, and Seachem Laboratories Reef Builder gives you a focused way to manage one of the most important pieces. This 1.3 lb container is made to raise carbonate alkalinity in your reef aquarium without immediately impacting pH, so you can adjust one value at a time. According to Seachem, with long-term use your tank will tend to stabilize at a pH of 8.3, giving your corals a steady foundation over time rather than the swings that come from guesswork.

• Raises carbonate alkalinity without immediately impacting pH, so you can correct alkalinity without worrying about a sudden pH swing in your reef.
• Helps maintain the carbonates that, alongside calcium, Seachem notes are essential to all coral growth in a reef system.
• Used as directed, the brand says it will not deplete calcium, magnesium, or strontium, which usually tend to precipitate as alkalinity rises.
• Supports long-term stability, with Seachem citing a tendency for the tank to settle in around pH 8.3 with continued use.
• Works alongside Reef Buffer, so the two products can be used together as part of one dosing routine.
• Pairs with calcium supplements like Reef Advantage Calcium or Reef Complete to keep both carbonates and calcium in balance.
• Targets a common reef challenge, since Seachem warns that deficient carbonates or calcium can halt coral growth and lead to a rapid decline in coral health.
• Made for the specific demands of a reef system, not a general freshwater additive you would reach for in a community tank.
• The 1.3 lb size gives you a generous working supply for ongoing maintenance dosing between reorders.
• Comes from Seachem Laboratories, a name reef hobbyists know well in aquarium water care.

Use Reef Builder when you need to raise carbonate alkalinity and pH is not a concern, and lean on Reef Buffer when you also want to bring pH up toward 8.3. Together they help you hold the carbonate and calcium balance your corals depend on through every stage of growth. Always follow the label directions so you treat your reef the way Seachem intends, and give your aquatic family the stable, consistent environment they need to thrive.