Sounds like a sponge or a tunicate. They're pretty small, right? About a centimeter tall max? And they're probably in the shade...
Anyway, that's my guess. If that's the case, there's nothing to worry about at all. Just some good filter feeders.
HTH,
Danielle
Anyway, that's my guess. If that's the case, there's nothing to worry about at all. Just some good filter feeders.
HTH,
Danielle
