Once your PH rises to 8.2 your xenia should bounce back like nothing happened. Quick changes in PH are very stressful to reef invertebrates. The general rule of thumb is that PH should not fluctuate more than 0.2 +/- within any 24 hour period. Silicates would explain the diatoms issues although Calfo also says that excessive iodine may contribute to diatom outbreaks. Are you using RO/DI water? I think kent makes a silica busting DI cartridge. Could your silicates be coming from somewhere else?
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