does anyone know what this is?

[shsjr89]

here you go

[dakar]

Really hard to make out any details, can you describe it at all? Like is it moving around your tank...just growing there.... tough to make a guess at this point.

[Reptoreef]

Looks like some sponge next to the polyps... as for what's in focus... a Chilian Sponge. It's a type of non-photosynthetic coral.

[shsjr89]

it stays in the same place and it has tubes from the middle going to the outside

[Reptoreef]

I say sponge.

[dakar]

Same here...likely some sort of sponge

[shsjr89]

are they good or bad? what do they do?

[JustDavidP]

Sponges are good things...natures own filtering system. They can pump hundreds of gallons a day through their flesh. They typically like subdued lighting. Also, try to never take them out of water. They don't fare well if they have been exposed to air.

I've got yellow sponges, red sponges, white sponge, and a gorgeous purple sponge that is growing in my fuge.

Lucky you!!

Dave

[Grandmaster_Toad]

I have yellow versions of those no my rocks...they are good things. Usually dont get very bid, but add nice color to the reef