sponge? or what?

[cmar]

hey, does anyone know what these things might be? hopefully the pic is o.k. enough for someone to be able to tell, if not, i'll try again.
thanks! ( 3 globs, bottom center, just above the sand )38685

[Reefscape]

Yes, they are sponges....just filter feeders...they will come and go depending on nutrient levels in the tank..

Niko

[cmar]

great, thanks! i've had a couple for about 6 mos., came on some rock. lately, they've decided to go a little nuts, so i figured i'd better be sure of what they are.
thanks again!