You do seem to have a lot of extra nutrients in your system if none of the things you've tried in the past have worked. I am surprised you've run as much GFO as you have and made no progress. Even my tank with hundreds of pounds of curing dry rock with no skimmer as of yet was cleared up with just a couple of cups of GFO.
I had that same brown looking build up I believe to be Diatoms clear up pretty quickly. You have snails in your tank now I believe and they're not dying. I would add the Ceriths and see how they fare.
I had that same brown looking build up I believe to be Diatoms clear up pretty quickly. You have snails in your tank now I believe and they're not dying. I would add the Ceriths and see how they fare.
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