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Try changing from cup to flake or homemade fresh. Frozen cubes are the *highest food* in phosphates. All food will contain phosphates but frozen is the worst. I would also try using a micron sock in the sump to "filter" particulates out of the water column. I bought a $25 mount at PA and use the $5-6 dollar bags. Buy alot of bags though b/c they get clogged within 2-4 days depending on what you are doing (ie from doing nothing to blowing detritus off rocks). The good thing is they are reusable. I save up about 6 (I use 2 socks at a time in my 180) and wash it in hot water for 2 washings. Some people use bleach but if you go that route it requires a little extra work to make sure you don't get residual bleach in the tank.Make sure you suck the detritus out of your sump when doing water changes if you choose not to do the filer sock route. The filter sock will polish your water to crystal clear as well as take out organic particulates.
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