Ok so I have a remora pro with mag 3, and the biggest eheim wet/dry canister ($$$$). Anyway i'm having trouble keeping my water clear. My rocks are looking dirty with a bunch of brown dust sitting on them, and around them. I think what part of the problem is, is that I'm not using RO water (yet) I bought a phos-zorb and it worked great but it got old and I took it out and haven't replaced it yet. so I think phosphate is building up and causing ugly brown algae. But what should I do about mechanical filtration? Because filter floss in the eheim is useless. The way it lets the water trickle down, the floss hardly sees much water and it doesn't collect much. I put a floss sleeve over the intake of the filter and it got pretty darn dirty, quickly. I was told that mechanical filtration was bad because it caused nitrates to build up. and that all I needed was a good skimmer (which I have) and good bio-filtration (which I have). So now I'm angry because, it seems that mechanical filtration is very much needed in a 90 FOWLR system. So what should I do guys? what kind of filter should I buy now??