I have a 60 gal tank, live hawaiian black sand, artificial coral, 2 power heads, bubble wand and temp stays at 78*. Cycling for about 5 weeks now. SG = 1.025, Ph = 8.2, everything else is 0. Have a yellow tail damsel, 2 three stripes damsels, 1 sand sifting starfish, 1 spotted blenny and 6 hermit crabs. Have 2 clown fish and 1 purple something or other in QT that were supposed to go into my dsplay tank this weekend. Tonight I noticed that one of my damsels was lethargic laying about the bottom of the tank and looked like gasping for air. Managed to isolate it and put it in a small bowl just in case that it is contagious. What can be happening with it and what to do right away to fix the problem?