White filmy stuff

[jbc123]

Today I noticed a white filmy patch hovering over a piece of LR. It's pretty small, maybe 3cm x 3cm or so. It doesn't look like spiderweb like a vermitid snail, it's really uniform and thin. Not stringy. Almost like mold. There isn't anything really under it except bare rock and maybe a little coralline. It's suspended about 1cm above the rock.

Should I be worried!?

 

[Sk8r]

Something's probably died there inside the rock. Run your tests. Hopefully you have enough live rock and sand. If you see ammonia, try a little Amquel.

 

[jbc123]

Yeah, I'm going to the LFS today and they'll do a water test. I had it tested Saturday and it was perfect.