sponges

[Bolo101673]

Can anyone tell me what these are?
I have them all over my system.

 

[TFP Marine Biologist]

They are a type of sponge, most commonly refereed to as Pineapple sponges, which is a very general term that could be several species. They are harmless filter feeders for the most part, usually find them in areas of high flow, very common in filtration systems.

 

[marinemanohio]

Due to pineapple sponges building up in filtration areas, keep an eye out for them clogging up pipes and inlets. Once you get a few, they usually reproduce like mad!

 

[Bryopsis]

Need a better picture... Pineapples are the most common, but unless it's just too fuzzy of a pic, that doesn't look like this
http://public.fotki.com/justbcaws/fish_4/dsc04626_sponge.html

Maybe the one in the center is special.