Ricordea melting

[al404]

Hi I bought 1 and 1/2 month ago with 4 ricordea for my 15G tank

One is getting really big and 2 of the others near the big one did melt away in about a day
My po4 are 0.10 and no3 0.5

What I change in my tank since a couple of weeks is that I add a second power head and now I switch the 1sth one off for 1 hour in the morning and 1 in the afternoon and get the 2nd on

My tank is a softy tank and thinger coral are open
Could the big ricordea kill the other one?
Could it the water flow?

I never feed them

Both the 2 disk that died the like shrink and did close inside a gelly bubble

 

[Dkuhlmann]

Need to see a picture. But this thread being about mushrooms belongs in that forum located down the forum list a bit. Here is a link so you can post it there or a mod may move this one.

http://reefcentral.com/forums/forumdisplay.php?f=202