First let me say that I have not read the entire thread. When I had a similar problem a few months ago, I was asked how old my lights were, my TDS reading on RO water and about my clean-up crew. A dozen additional red legged hermit crabs in my 75 gallon tank made an immediate impact on my problems (after upgrading my RO/DI system and replaced my VHO lighting with new tubes). Just a few thoughts to consider if not mentioned previously.
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