Can some one identify?

[Calgarynewtankguy]

I am at day 4 of my new tank an thi seems to be growing fast in my tank and I am unsure what it is. Any ideas???

[Aquattro]

Looks like sponge. Not something I would worry about.

[soapy]

I have a sponge that looks very similar, although mine grows in cracks and such and not so much on the surface like that one.

[11purewater]

sponge dying maybe,looks like a bacterial film

[daplatapus]

Kinda reminds me of something I saw on Aliens.... just sayin'. Sleep with one eye open

[11purewater]

Damn you Bishop!