What is this white thing?

[money88]

I noticed this on my zoas before and I pulled it off once but I thought it may have just been some dead flesh but it appears to keep growing over time. I am thinking this is some sort of a sponge like: http://www.melevsreef.com/critter/white-sponge?hide=true

 

[BestMomEver]

I dunno but it’s weird! Someone will come along soon!

 

[Lovemyreef2015]

Its sponge, harmless filter feeder. If you want to remove use a soft toothbrush or tweezers.

 

[money88]

Its sponge, harmless filter feeder. If you want to remove use a soft toothbrush or tweezers.

Will it start to bother the zoa that I should move it?

 

[Lovemyreef2015]

Sponge while typically harmless can suffocate polyps if it gets out of hand. We let it grow on the rocks and in the sump but removed some occasionally

 

[Jeffrey Dunn]

Its like 90% of the time its a sponge but you are always amazed at how different they can look.