Chalice Coral melting in one spot?

[Valentini89]

So just recently I took the plunge with corals. I have aquired some large pieces but I'm new to all this and still
Have many questions. One Coral is a real pretty great wavy one, has to be fed and retreats into a ball when disturbed. Another leather looking one "droops" and looks melty but then returns back to it's normal healthy looking self. What I'm interested in finding out about most right now is a nice green chalice that looked great when it was put in the tank, but then pressure from a powerhead broke off a tiny piece, and now it looks "melty" in one spot and another tiny piece has come off.

 

[swhobbie1]

chalices usually like low to med flow. If its in the path of a power head blasting it prob shoud move it

 

[homer1475]

Pics?

 

[Valentini89]

Pics?

http://s345.photobucket.com/user/De...626_112836784_zpsabwjfxo5.jpg.html?sort=3&o=0

You can't see where that one broke off, it's just a small spot.. I bought it from the lfs and it was too big for a bag, he had to put it in a bucket. But would water pressure cause a chalice to break like that? Where it is limp looking at the tear sight?

And this next one, LFS told me has to be fed and doesn't usually last longer than 6 months in an aquarium. It retracts totally into a ball. You know what this is? It's a fairly big one.

http://s345.photobucket.com/user/De...626_112823436_zpsafp1qt9v.jpg.html?sort=3&o=1

I have a big green one also that gets larger and smaller, I'm not sure if it's the light or not. It has like, "lobes" is the best way I can explain it. Sometimes it looks like it's pulsing. Maybe it's just the water pressure.