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...
xXInkedPhoenixX Posted March 12, 2022 Share Posted March 12, 2022 (edited) Hi. This is an "it depends" answer. If the water you use is really acidic naturally it will be eating away at the coral much more often (this is the chemical reaction that lowers your acidity and raises kh/ph). I put some coral in the substrate of my original tank and it's been in there over a year with stable kh/ph readings. When you put it in a filter it may wear down faster. So I would say personally the rule of thumb would be when you start to see fluctuations or if you do a complete cleaning of your filter you could replace it- but it certainly does NOT need to be replaced often. Edited March 12, 2022 by xXInkedPhoenixX 1 Link to comment Share on other sites More sharing options...
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