So I have the 9002, or should say had, and have hated the damn thing since day 1. horribly finicky when it comes to water level, the pump went twice, the pump would consistently fall out of the bottom, and it never really produced much skimmate.... in comes my decision as to which way to go from here. RIght now I have no bioload other than a few snails. I'm in the midst of essentially a rebuild (new sand bed etc), and I want to get all the filtration locked up before I restock. Does anyone have an opinion on the 9001 vs the 9004? Is the 9004 that much more superior? also lookin @ the hydro slim skim... any thoughts/opinions are appreciated