2 other damsels, a sailfin that ruled the tank, a maroon clown and a blue tang. Chlorine was zero, PH is always at 7.8 despite trying to add buffer. PH is always 7.8 even with fresh salt mix. Alk is high at 2.9. I use a marine kit, yes. The fish have been stressed for the last few days, don't know why. We did about 50 gallons of water changes over the last two days. The only thing I have added that I don't think contributed is "super blue" filter pad in my filter. I don't have any other test kits.