alot of them

[inspire0522]

any idea what these little things are.. they have taken over my tank...

 

[FishFrik]

I don't know what you are referring to. Can you circle it?

 

[inspire0522]

sorry about that.. its right in the center of the picture. A little off white left side of the crab.

 

[FishFrik]

Oh i see it now. They are Q-tip/Pineapple sponges. Harmless filter feeders but usually an indication of excessive nutrients. Better water quality will help reducing their population. Also they don't tolerate bright light. I've read that linkia starfish will eat that stuff. HTH