What's has happened to my GBTA?

[MFear]

a few weeks ago my GBTA stopped opening all the way and would stay semi open attached to his rock. In the last couple of days though he's closed completely. I think I may be battling Dino...could thatbhave something to do with it? Otherwise my parameters are all in check. Is he done for?

 

[Humblefish]

Dinos do release toxins into the water which sometimes kill fish & inverts. Best thing to do is run carbon to remove any toxins. Can't hurt.