I have lost a blue spotted puffer, kole tang and a flame angel in the past week! None of them showed signs of illness (no white spots or rubbing on rocks) the puffer did lose color and perch on some rocks but people said that was him "sleeping". I had my water tested at 2 different LFS
and both said my parameters were really good (minus the high salinity that has been fixed). My tank is 90 gallons with a 20 gallon sump and I am running an in sump protein skimmer. I have 2 fish left in the tank, the fox face that was the 2nd fish added so he has been there for a while and the banana wrasse who is the newest addition( about 2 weeks). And they both look fine and are eating normally. Can anyone tell me what might be going on? Or what I should do?