What is it?

[Juliekerley]

Hey guys so very odd. My convict tang who has been very healthy, in fact tank has been healthy for awhile now, died last night and now today I noticed this crap growing on the sides. Any idea what it is? How do I treat it? All parameters are in normal range.

 

[IAReefer]

Looks like coralline

 

[Deberber]

Yep, that is coralline algae. It is a harmless algae that shows your tank is cycled and maturing. This would not have been related to the death of your convict.

 

[YankeeTankee]

I'd say coralline also, this is unlikely but is you're alk super high - calcium carbonate precipitation?

 

[Juliekerley]

I'd say coralline also, this is unlikely but is you're alk super high - calcium carbonate precipitation?

All is normal. Thanks guys