Wat are these white things on my glass by my filter

[bearsfan420]

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[Bucknutz]

Pineapple Sponge maybe? Harmless filter feeder.

[Twizted1]

Look like flat worms. Can you get a little clearer pic?

[andys1982]

Looks like more tunicates to me.  There's another recent post where someone is asking about them, maybe see if his pic looks like what you have.  If they never move, they're likely tunicates (sea squirts) or sponges.  Like buck said, harmless filter feeders and a decent indication of a maturing system.

[andys1982]

Oops.  The other guy was you.  Guess I beat a dead horse here.