I performed a 10 percent water change on my 90 gallon tank 5 days ago and since then I have had a diatom bloom. My tank is a 90 gal with wet/dry, HOB reef Octo skimmer, dead rock that was starting to show what I think was coraline algae (it was purple), 3 inch live sand bed and 5 fish. I test water 2x a week. Parameters are perfect for the past 2 months. The tank is 3 1/2 months old. Did the water change restart the diatom cycle, and should I hold off on water changes?