I've understood that carbon can do detrimental things to chaeto in some cases, another is the positioning of your chaeto where should be at the top, almost exposed - or maybe on some live rock to get going. Another option could be a low dose of iron.
If your curious, try stopping carbon for a week and see if you notice a difference. It's starving for nutrients, and iron depletion in the tank would cause it. And if you have your lights on 24/7, try putting them on a timer for the opposite of your DT light schedule.
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