Can I use crushed coral in freshwater aquarium?

crushed coral is fine as long as you don’t need a lower ph, i have some in my 75 hap tank 6 months running and have a stable ph of 7.8 as a result. but it may damage bottom fish and glass as many shards can be sharp.Click to see full answer. Also to know is, how do I use crushed coral in my aquarium?Crushed coral is a great tool for raising your pH. We personally use it at 1 pound of crushed coral per 10 gallons of water when mixed in with our gravel. Crushed coral dissolves over time continually. The lower your pH is, the faster it dissolves. what is crushed coral made of? Some substrates are used to alter water chemistry. Crushed coral and coral sand both contain calcium carbonate, which will raise the carbonate hardness and buffer the pH. Peat may be used in some aquaria to mimic some soft water habitats. Just so, how long does it take for crushed coral to raise pH? Usually you should see a spike in kH within 24hrs or so after adding crushed coral. Adding crushed coral increases the buffer capacity of the tank via the kH. As your kH rises so will your pH. Any increase in acidity should dissolve some of the crushed coral keeping the water buffered.Does crushed coral add calcium?Crushed coral will increase the hardness of your water because it is extremely high in calcium carbonate. It will also boost your water’s pH.