bunch of grapes

if ur wondering about the green spherical opject, i would say that it is bubble algae. If ur wondering about the white thing under it, then i have no idea

i am wondering about the thing under the bubble algae. I would have posted this pic in the id forum but did not know how to do it. I am not sure what the green thing is. I know that the bubble algae is there but what is the other thing?

looks like a sponge, or tube plant

i have those in my skimmer i was wondering the same.

so are they bad?