Two days ago I set up my saltwater tank. The basic parameters are fine -- I have it at 80 degrees and salinity is perfect. The same day I purchased three damselfish, and I have noticed that one of the three is just sitting close to the bottom of the tank "gasping" for water. I'm kind of worried about it because it didn't seem all that interested in eating when I fed them this morning. Perhaps it's just stressed out? I put in a bubble wand that I had laying around thinking it might be a good idea to up the o2 saturation. What do you all think is going on?