Can anyone tell me about this yellow stuff on my rock?

reefkprz

Active Member
looks to me like your rock, Is whats left of a bright yellow Pavona decussata coral and there are still living pieces on it.
 

snakeblitz33

Well-Known Member
Looks like a pavona or pagoda or maybe even a yellow scroll. Won't know more until it grows some more. I'm with reefkprZ.
 

snakeblitz33

Well-Known Member
By the way, you also have a bunch of zoanthid polyps growing on that same rock.
Pavona Care: http://animal-world.com/Aquarium-Coral-Reefs/Leaf-Coral
Pagoda Cup / yellow scroll (same thing) Care: http://animal-world.com/Aquarium-Coral-Reefs/Yellow-Cup-Coral
It could also simply be a yellow sponge of some sort. Maybe if we could get a better description of the texture... (be sure to wear non-powdered latex gloves when handling corals and live rock.)
 

bruce lee roy

New Member
Thanks. I knew about the zoanthids but I thought this coral would be to aggressive for it and kill it. But they seem to be doing thanks for the links. I guess I will have to wait until it grows a but to know for sure.
 

snakeblitz33

Well-Known Member
Grow that yellow sucker out and frag it... that will be worth much more than those zoas you got growing now. lol
 

bruce lee roy

New Member

Here are some additional pictures. Sorry I couldn't post anything from my phone but I can now on my home cpu. It looks like its doing good with those zoanthids. I am not sure how much any coral would sell for I just buy them cause I like the way they look and if they are easy to take care of, plus I wouldn't know how to frag these things. I have some mushroom growing close to my frogspawns and I don't want to frag them off cause I am afraid of killing them.
 

snakeblitz33

Well-Known Member
At some point or another things will grow into each other and they will not like it - they will start chemical warfares, so you should have some carbon running in your system.
Fragging is much easier than you think. All it is doing is removing a part of the coral for relocation... There are different techniques depending on the coral and I am sure any knowledgeable person here would be more than happy to tell you their fragging methods for different corals.
Eventually, you will have to frag a coral in this hobby if you stick to it long enough.
 

spanko

Active Member
My guess is sponge. How long have you had the rock? When you got it was that part of the rock hidden from lighting? Did you just rearrange the rock in your tank and this rock was hidden on the bottom? Sponge like cryptic areas and will grow on the bottom rock in the back etc. where not much light gets to them. Perhaps this rock came from a refugium?
 

reefkprz

Active Member
poriferans are some of my favorite critters, and I highly doubt this is a sponge spanko.
its hard to tell but if you click the pics and blow them up as big as you can you see the "rock" has the same formation as the yellow leading me to believe its a coral thats mostly died off.
also if you look as close as you can the dots arent open holes like would be in a sponge they are closed solid leading me to believe they are polyps of a coral.
 

meowzer

Moderator
I only pasted picture for OP because I was not sure....at first quick glance I thought sponge until I saw the porelike things....so then I thought it was something else....and left it to the "experts" haha
 

bruce lee roy

New Member
Thankfully everything in my tank is a frag. I just started with the coral aspect like 3 months ago and started dosing with seachem calcium and alkalinity. I also have a couple bags of aquapure elite in my refugium. I have some mushroom, 3 frogspawns, 1 green trumpet coral, that yellow thing, and some zoanthids. Its all in a 93 gallon cube. With a few small fish in it. I have a small light on it but I plan to buy a bigger one in a couple months (right now everything is under the light), once I buy the new light I can expand the area where the coral lays so they are not so close to each other. I've had that rock with the yellow less then a week. It was given to me. It seems to be doing good under the light but it some of the yellow had some brown on it as if it didn't have enough light. I was told that it was at the bottom of the tank it came from. I put it under the light hoping that it would have less brown. As far as fragging goes I'm hoping i'm just going to have to pop some mushroom off of some rock and relocate it.
 
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