Seachem Reef Builder Biological Enhancer
Reef Builder by Seachem Laboratories effectively boosts carbonate alkalinity without causing an immediate change in pH levels. Over time, consistent use may help maintain a stable pH of around 8.3.
Both carbonates and calcium are vital for coral development. A shortage of either can halt growth and lead to a swift decline in coral vitality. To support coral health, ensure a supply of carbonates with Reef Builder and calcium through products like Reef Advantage Calcium or Reef Complete.
When used as instructed, Reef Builder will not reduce levels of calcium, magnesium, or strontium, which often precipitate as alkalinity rises. It can be paired with Reef Buffer. Use Reef Builder for increasing carbonate alkalinity without pH impact, and Reef Buffer for elevating both alkalinity and pH.
| Key Features |
|---|
| Boosts carbonate alkalinity |
| Does not affect pH levels immediately |
| Supports coral growth and stability |
| Safe for calcium, magnesium, and strontium levels |
FAQ
Can Reef Builder be used with other Seachem products?
Yes, Reef Builder can be paired with Reef Buffer. Use Reef Builder to increase carbonate alkalinity without affecting pH, and Reef Buffer to raise both alkalinity and pH.
Does Reef Builder affect calcium or magnesium levels?
No, Reef Builder does not reduce calcium, magnesium, or strontium levels when used as directed.
What is the recommended pH level after using Reef Builder?
Over time, consistent use may help maintain a stable pH around 8.3.

Samantha Walker –
I’ve been using Reef Builder for three months now and noticed a steady improvement in my coral growth. The alkalinity increased without any sudden pH shifts, which is exactly what I needed. My corals are more vibrant and active than before. I still use Reef Advantage Calcium to maintain calcium levels.
Theresa Dowd –
It works well for maintaining alkalinity. I didn’t see any pH spikes, which is a relief. I combine it with Reef Buffer only when I need to raise pH as well. The product is easy to mix and effective over time.
Kimberly Sanderson –
Great product for reef tanks. I was worried about pH fluctuations, but Reef Builder keeps alkalinity stable. My polyps are more active and the tank feels more balanced. No issues with calcium or magnesium levels.