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Aquattro;910023]Ya, suggested that. But that's a lot of water to make and store and move. Also suggested fozdown.
Problem is the rock is all old dead rock that will keep leaching, so that would be multiple 100% changes over a few months.
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Actually a 100% water change will do very little as the phosphate is bound to other thing in the tank , the good news is phosphates have a limit so it can only leach so long.
I agree lanthum chloride will do it but won't happen over night and the amount you'll need is going to be expensive .