Anyone explain why this spit out stuff

[dib]

I've had these in a tank I acquired for about a year. I think they are a type of mushroom. If anyone know different please let me know. The diameter is about 5 to 6 inches across.
Anyway, I have never seen them change color much. They shrink up when the lights go off. I have added two pics. In the first one is what they normally look like. In the second one the bottom mushroom is still normal, but the one on top has turned very green. It shriveled up like crazy and started spitting stuff out of the center. Next day it was back to normal. Is this something to be concerned about? Why did it do this?
Thanks

 

[TJ's Reef]

I would think normal behavior and probably just expelling a meal as their mouth and anus are one in the same. Typically they can and will expel unused food and or excess zoox (symbiotic algae)

Cheers, Todd

 

[dib]

They look different than my other mushrooms. Are they still a type of mushroom or something else?

 

[Reefing Madness]

Looks like a Ricordia Yuma to me, not a mushroom.

 

[dib]

Looks like a Ricordia Yuma to me, not a mushroom.

Ok cool. I've never done anything special with these things...... do they need certain food or tank dosing?
By the way, the last pic of my mushrooms, are they all mushrooms or is the real green ones something different?

 

[Desert Orchid]

All mushrooms. And depending on the intensity of light some of them will morph into a brighter color or the spots may become more pronounced. Keep them away from lps like hammers and frogspawn also all sps as they will kill them or at the very least damage them. Even had one damage the edge of a very beautiful chalice and take out a couple of branches on my frogspawn. You don't need to feed them though they do like higher nitrates. Can always tell when my tank is overdue for a water change as the mushrooms are very happy. They can be quite prolific so watch where you put them Good luck and nice photos!

 

[shred5]

Looks like a Ricordia Yuma to me, not a mushroom.

Its a type of Rhodactis..
[h=2][/h]

 

[Dylan J.]

Its a type of Rhodactis..

+1 defiantly not a yuma

 

[shred5]

Have you changed anything in your tank like lighting?. Changed bulbs? Could just be expelling some zooxanthellae..

 

[dib]

Nope haven't changed anything. As for them being near other corals good to know, but I have no intentions of adding coral to this setup. Whatever grows is fine. I even have a flourishing batch of aptaishia...lol

 

[Tahoe61]

Mushrooms will for whatever reason (it's usually a water change) expel their mesenteries and then return right back to normal.

 

[Desert Orchid]

+1 to Rhodactis in the first photos. Just saw some identical ones on another website. Nice.....

 

[Desert Orchid]

Nope haven't changed anything. As for them being near other corals good to know, but I have no intentions of adding coral to this setup. Whatever grows is fine. I even have a flourishing batch of aptaishia...lol

I never intended on keeping anything but fish, then went to a FOWLR...... on to just a few mushrooms..... well those did well so lets try some LPS and now 3 full blown mixed reef tanks though the 72 is sps dominant. Have fun with whatever you do it is SOOOooo addictive! *L*

 

[dib]

+1 for an addiction! I'm setting up my 3rd saltwater. This is going to be s 20g nano reef