Id Help...good or bad??

[JWJTide21]

Ok so I have 2 things in my frag tank that I am not familiar with... I would think that they are sponges or something similar.

So I am looking for some ID help and also are they a problem???

Ok the White stuff on the bottom

Here I am trying to identify the white thing above the tubeworm and the pinkish red stuff to the bottom right (it is on the underside of a rock )

 

[DMBillies]

My GUESS is all sponges.

The first pic has the structure of yellow sponges I've seen that generally do well in the aquarium. I've not seen a white one, but structurally it looks pretty identical.

In the second pic, the pink looks like a dead on match to a pink sponge I have which has been growing nicely in my frag tank. Can't really see the white thing in the second pic...

 

[JWJTide21]

i was thinking sponges but the lil white ones from the 2nd pic are growing everywhere on my frag plugs....starting to look bad and i think it could be blocking the growth of my acans

 

[Fanof49ASU]

I had one of those sponges in the first pic, and it started growing over my zoas.....killing them. I had to take the rock out and scrape away what I could.....then I added a cowrie for good measure. So far, so good.

 

[DMBillies]

I've not had any problems with sponges over-growing corals, but I'm sure it can happen. I'm guessing from the egg crate that this is a frag tank?

I know one thing, they grow like crazy in my frag tank... which has the crappiest lighting, least flow, and the dirtiest water of all of my tanks (hard to justify spending lots of $$$ on it when I can spend that money on better toys for the displays). I posted a thread a while ago about a black sponge in that sump budding (truth be told my sump turnover rate is abysmal because the homegrown overflow...done before I got the tank...can't handle more than about 250 g.p.h. without flushing). They don't bother me because they've not bothered my corals (which grow pretty well despite the water and being under PC's).

If they are giving you trouble I would think more flow and getting as much of the particles out of the water as possible would help (of course I don't know what kind of set-up you've got and you might already be doing plenty of both).