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Old 02/09/2018, 10:27 PM   #9
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Join Date: Nov 2010
Location: New Braunfels, TX
Posts: 647
I would do some big water changes regardless. Did you just start lighting your tank? Diatoms usually bloom when a tank first cycles or if there's silica present. Those are very hardy corals and running your lights for 12 hours, while is a long time, is not going to kill them. You might also want to run some carbon for a bit, just in case. Are you using an RO/DI unit or tap water? If you're using an RO unit, check your TDS, your filters might need to be replaced. If you're using tap water, then who knows what could be in it. It could be copper poisoning or something.

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