Anyone know what this orange is?

[Junk2]

Anyone know what this orange stuff is that's showing up in my tank? It's on the frogspawn rock, and it's a few other places in the tank. I have never seen it before and it seems to be spreading.
Thanks

 

[radiata]

Could be sponge...

 

[Junk2]

Could be sponge...

That's bad right?

 

[mnat]

Sponge is good but I don't think that is sponge. Do you have a more zoomed in pic.

 

[Mark_C]

Tough to tell from shots, as mnat said. May just be a diatom outbreak, can appear rusty orange/brown.

 

[Junk2]

It's tough. I'm horrible with my cell phone. This is about the best I have.

 

[Junk2]

Hmm, yeah, after studying pics online that's what it looks like.... a diatom outbreak. Uhg.

 

[DangerDave]

Hmm, yeah, after studying pics online that's what it looks like.... a diatom outbreak. Uhg.

Ewww diatoms. I feel ya @Junk2 , It’s the only problem with my tank I haven’t overcome....I’m gonna sit here and cry about it now.