Yellowish crust

[ffiel2]

Can someone tell me if I should do something to my zoa. It has a yellow crust on its mouth

 

[RareEarthCorals]

Does it flourish or do the zoas remain retracked. Detritus sticks to them like glue. Zoas like flow to stay clean. Best of luck.

 

[ffiel2]

Only those three in the bottom. The top opens up and seems to be happy.

 

[RareEarthCorals]

I would use a soft brush like a new makeup brush and see if you can knock it off. Dont use a finger as it may cause damage or even hurt you in the process. It looks heathy otherwise then just keep an eye on it after you clean it up. Move it to an area with a stronger indirect flow.