Duncan coral has growth on it?

Ahhh yeah that could be it. All my other lps are doing great tho so idk.
 
I have 2 torch corals and a hammer and a goni all doing great good polyp extension and color no problems but I stopped running my skimmer and I’m ab to manually remove more algae today. I manually remove algae off the rocks once a week about.
 
I have 2 torch corals and a hammer and a goni all doing great good polyp extension and color no problems but I stopped running my skimmer and I’m ab to manually remove more algae today. I manually remove algae off the rocks once a week about.

If you are still at the diatom stage, then your tank is still going through the maturation process and keeping coral can be difficult at this point. Has the healthy coral been in the tank as long as the Duncan?
 

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