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Potassium issue?

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I've started to see these holes and am wondering if it is a potassium issue?  They are not small pin-head size holes so I'm not sure.  Is it potassium or is it from the fish chewing on the plant leaves?  I fertilize with 3 ml APT 3  Complete at 3 ml daily in a 20 gallon tank.  This is the only plant in the tank that has this issue.  I know that a Java Fern likes a lot of potassium yet it seems fine.




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