Just spent 2 hours scrubbing/vacuuming off the diatom brown scum explosion on the bottom and sides of my tank. any ideas on the potential culprit, so I can prevent this mess again?

Here's the lowdown: 6 weeks old 125 gal fowler 100 lbs Walt smith LR Turboflotor skimmer w/d filtration 2 watts/gal power compacts (6-8 hours/day) two powerheads 3 damsels pH 8.4 SG 1.022 T 81 constant NH4 0.25 nitrate and nitrite zero ca++ 410 3 days previous to the bloom, I was adding one tsp of coral vital by marc Weiss per day (now halted). 4 days prior, I place Dacron polyester in the return cup from my skimmer to decrease the fine air bubbles (now removed). I performed a 20% water change as well; water is made from aged tapwater and Coralife salt.

I added a cleanup crew (emerald crab, scarlet hermits, blue-leg hermits, turbo snails) as well. Any other insights or ... more.

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