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???

http://img.tapatalk.com/d/12/11/11/uqyzyge6.jpg

[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:sad:

[daplatapus]

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

[11purewater]

Damn you Bishop!

[windcoast reefs]

I would say its a sponge as well, I wouldn't worry about it.