I have a 20g high reef with 150w MH for lightning. My galaxy coral isnt fulling extending and i had noticed it about a week ago not looking as well. I had this problem with this perticular coral before but it had since recovered. Anyone know any common problems with galaxy corals? I dont test my parameters and keep my salinity around 1.023-1.025 and temp stable. i moved it lower in the tank and made sure to inspect for pest but cant find any simple problems. thanks.