Wow, you're using almost the same things i'm using, yet i don't have that problem.
I was told to remove the crushed coral out of my tank since it tends to accumulate detrius and apparently is a phosphate and nitrate factory, but i'm not sure.
I think you should maybe try to do a search on diatoms or ask some experts around here about that problem, since i don't really know what else to tell you.
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