White slime substance. Any idea?

[jay24k]

I noticed on my rock and a sponge there is a white slime substance on it. It almost resembles a cocoon of a caterpillar. It doesn't appear to be on the rock completely. Most of it is but it almost looks like it encapsulates part of the rock. Is this ok? Should I clean it off or power head it off?

Thanks

[jay24k]

I touched it with my fishing net and it comes off really easy. It appears what is underneath is a sponge of some type. Kind of like a blob type sponge. The red one seems to be breaking up so I stopped messing with it. The other one is on a green one and it still is soft and not flaky. Is this possibly a way they are healing? Or is this decomposing?

Thanks

[jay24k]

It looks like its affecting 3 rocks so far. It appears to be only on my sponges and nothing else. Bumping for any other ideas that people might know of.

[rmendis]

Sounds like it could be something decomposing. If you rock is curing, it is likely dead sponge flesh.