Pisces USA AquaNatural Coarse Aragonite
Designed specifically for use in marine and reef aquariums, Pisces USA AquaNatural Coarse Aragonite is a naturally occurring form of calcium carbonate (CaCO₃). It helps maintain ideal water conditions by stabilizing pH levels between 8.0 and 8.4, which is beneficial for saltwater and certain freshwater environments.
Known for its high buffering capacity, aragonite supports stable alkalinity and gradually releases essential minerals into the water. This promotes healthy water chemistry, supporting the growth and well-being of corals, invertebrates, and specific freshwater species.
| Specification | Value |
|---|---|
| Material | Calcium Carbonate (CaCO₃) |
| Form | Coarse |
| Recommended Use | Marine and Reef Aquariums |
| PH Range | 8.0 – 8.4 |
FAQ
What is the primary function of AquaNatural Coarse Aragonite in an aquarium?
It provides buffering capacity to stabilize pH and alkalinity levels, supporting healthy water chemistry for marine and reef environments.
Is aragonite suitable for freshwater aquariums?
Yes, it can be used in certain freshwater setups where maintaining a higher pH is beneficial, though it is primarily recommended for marine and reef tanks.
Does the aragonite release minerals into the water?
Yes, it gradually releases essential minerals like calcium and carbonate, which support the health of corals and invertebrates.

Virginia Morgan –
I’ve used this aragonite in my 55-gallon reef tank for six months. The pH has stayed stable between 8.1 and 8.3. My corals have grown steadily, and the water chemistry feels much more balanced. Easy to add and doesn’t clump.
Zoe Lambert –
Good product for maintaining alkalinity. I added it slowly over several weeks and noticed a steady rise in pH. Works well with my live rock setup. A bit coarse, so it takes a little time to settle.
Sean Hughes –
This aragonite has helped me maintain consistent pH levels in my marine tank. I mix it with my substrate and it dissolves slowly, which is perfect for long-term stability.