I started using GFO after having non stop phosphate problems with a previous tank. I put it down to the old rock. It came from an older fish only tank with very poor lighting. It seems the phosphate was leaching out of the rock for years. Water changes would not reduce it. The only way I was ever able to get it under control was with the GFO. I am guessing if I reduced it now I would not have as much of a problem.
Are there other viable alternatives? I am building an algae scrubber at the moment actually. That might enable me to get rid of the GFO from what I hear from other peoples experience.
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