Ok as i said before this is what I think you should do. That means more like 100 lbs of live rock, and remove all fish/coral from the tank while adding this live rock. also carbon wont remove your nitrites only the bacteria growing on the rock, in the sand, and on the biowheel will. i would only hook up the other filter as a TEMPORARY and will say again TEMPORARY fix to a LONG term problem. The fish should be removed from the system asap. and live rock added






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