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umm could be too many fish for the filter to handle. whats in the tank at the moment?
plus, have you looked into reactors? ive got a biopellet reactor that its main purpose is to remove and reduce nitrates/phosphates. and it does it in a more biological way..... if you can find a place to put it.
Ever heard of Aquaripure? Apparently they work. It's a little canister filter that removes nitrate via anaerobic bacterial action. You feed it a tiny bit of vodka once in a while to keep it going.
I have a clown fish, two demsels, a firefish and a fire shrimp.. With 30 lbs of live rock and live sand.. The tank has been set up for about a month and 1 week.. I feed them every other day.. I have a aquaclear 70 power filter a cpr protein skimmer..
Have you thought about making a sump? Adds more water to your system and decreases nitrates. Plus gives you a chance to put more filtration and a bonus refugium. Hope this gives you an idea or two. My bio load is huge but I maintain my nitrates at 5 with my sump.
It's basically like a secondary's flow tank. Just look up 10g sump builds and it'll show you a whole bunch of different ones. It's really depending on your preference as you could tell from my earlier post my sump has 3 chamber but if I wanted I could have put more.