Iv had a trumpet coral for over 3 months now it has over 30 heads on it. the tank had a blue tang which of two weeks ago began to pick at the flesh on it. the trumpet then closed up so then i removed the blue tang from the tank. It has been two weeks so far and still it isnt filling up with water and expanding. Is there any other reasons or ideas why it isnt opening up anymore? Also i noticed small snalls the size of pyramid snals that affect clams around the trumpete, however thier shells are while and black stripes.