Sick bubble tip

[sansouci01]

I've had this GBT for about 3 months. It adapted to my 20 gallon tank very well. My clown started to host it within a couple of days and the two of them were very happy. About a week ago, it started to move and ended up behind the rocks. It had closed up except for a few tentacles sticking out. I fed it a small piece of silverside just to see if it would eat it and it did. I turned the rock around to see if it would open back up but so far it has only opened a little. My tank is 2 years old..Water parameters are:

Sal..1.025
temp..78F
nitrate..0
phosphate...002
cal..450
alk..10.2

None of these parameters have changed within the last three months. I do a 20% water change weekly. This is a before and after pic...

 

[Dkuhlmann]

Two things, Clowns don't host the nem, the nem hosts the clowns.

You don't say what you have for lighting. If T5 and your bulbs are more than 7 months old I'd look into getting new bulbs.