are you dosing flourish excel by chance? i've always had cloudy water when dosing it to the recommended levels on this forum... even the recommended dose on the bottle leaves my water a bit hazy. if you are using it, try cutting it out of your routine for a couple of water changes and see if that helps any. If you're not using excel, then how about adding some polyester floss to the filter? or perhaps running a diatom or uv (if you know someone with one you can borrow) just to see if it knocks it out. if it is bacterial, it should pass, even if it's taking too long. cleaning the filter material too often or with tap water kills the good stuff and leaves room for this harmless but nuisance cloud bacteria to hang around. also, do you have any fish that are diggers? possibly even at night? i've caught my clown plecos digging tunnels around the rockwork in the sand in the early morning hours, and that always leaves a dusty mess for a day or so. if you have fish constantly poking around in the substrate (it would have to be something more substantial than cories, etc... i'm talking about real dirt pushers.. cichlids, plecos, etc) it could also keep your water a little on the cloudy side.
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