What is your N03 level? Low levels is usually where chaeto struggles.
Chaeto's uptake of N03 to P04 is 100-1, so it's easy to create a limited nitrate situation.
I find it hard to believe carbon is sucking up all the organics the chaeto uses. It could be creating clearer water than previously and maybe light inhibition is an issue, but that's probably a reach.
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80g Rimless Acropora System
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