So after having my water tested this morning I've found out that my phosphate level has dropped from 2.5 down to .46... awesome! But I guess I still have a nitrate problem. I do overfeed, cutting back is easier said than done with my list of fish. It can also be a problem where the rock may be leeching nitrates back into the system just from being "old". The guys over at Reef Raft gave me a regimen to follow for vodka dosing, but I need experienced opinions if anyone has ever done this without running a skimmer?