TeeJay Posted March 12, 2022 Share Posted March 12, 2022 I added crushed coral to my filter to help raise my kh. When I started I was at a 0-1. It has been 21 days since I added it. Kh has raised to a 3. How often do I need to replace the coral. I have live-bearers and snails in my tank so I know I need to get it higher than where I'm at now. Link to comment Share on other sites More sharing options...
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