My local Home Depot sells crush coral sand where they sell cement bags. I am pretty sure it's cheaper than a pet store bag.
Thanks for sharing, it gave me an idea. I'll run some test on it. I used it before, but I forgot why i stopped using it. I think it made the water milky and I was too lazy to rinse it.
Coral chips or
coral sand can indeed contribute to the
carbonate hardness (KH) of freshwater aquariums. Let’s explore how:
- Buffering Effect:
- Coral chips and sand contain calcium carbonate (CaCO₃), which is a primary component of their skeletal structures.
- When placed in water, they slowly dissolve, releasing calcium and carbonate ions.
- These ions act as a buffer, helping to stabilize the pH and maintain KH.
- Natural KH Enhancement:
- As the coral material dissolves, it increases the KH by providing a source of carbonates.
- This is especially beneficial for soft water (low KH) aquariums, where maintaining stable KH levels can be challenging.
- Considerations:
- KH levels should be monitored regularly to ensure they remain within the desired range.
- While coral chips/sand can contribute to KH, they might not be sufficient on their own.
- Other factors, such as water changes, substrate, and additives, also impact KH.
Remember to test your water parameters periodically and adjust as needed to create a healthy environment for your aquatic inhabitants!

