White slime like stuff in tank

[katiemcguan]

Does anyone know what this white slimy stuff is floating in my tank?
it’s a new tank almost completely done cycling.

 

[ScottR]

Welcome to REEF2REEF. Hard to tell without a microscope ID. But it looks like you’ve started with live rock. Probably bacterial and should clear up. A lot of fighting between bacteria happens in this stage during live rock cycles. Usually you’ll see a bacterial bloom. If your cycle is near complete, a water change won’t hurt.