what is this?

i found this growing on a piece of my rock.. i'm not worried that it's bad because it doesn't look like anything bad for the aquarium.. anybody got any idea???

 

snakeblitz33

Well-Known Member
It looks like the beginnings of a chili coral or a carnation coral, could also very well be a christmas tree coral.
In any either case, whether it is a sponge or coral, I don't see it causing any problems at all.
 
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