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What you are describing sounds like diatoms, and your photos are consistent with diatoms. The normal trigger for diatoms is silicate. In my tank I have also found that iron triggers diatom outbreaks.
Do you have many sponges in the tank? They also need silicate.
Are your RO/DI filters up to date? Exhausted filters could lead to silicate in your make up water.
Dennis
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560G Miracles tank in process
making a DIY DyMiCo style filter (for 560G)
Current Tank Info: 560G Miracles tank in progress, 80Frag Temporary
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