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I have a kalkwasser reactor for my top off, and I don't have a problem with phosphates at all. I was worried that I might cause elevated phosphates from feeding the tank more to purposely increase the nitrates, so thats what prompted me to add the gfo again. I have mangroves and syringodium grass in my refugium, and it does grow much better when I don't use gfo, for obvious reasons.
Leland
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