Hi, I had a powder blue tang which got ich and died within a few hours. I also lost a long nose yellow butterfly which also got ich and died. I’ve almost lost all my fish this week but no white spots on them. Nothing that I can actually see. All my parameters are acceptable. My temp was at 77 f for some reason. Would this be the cause of my fish dying. I’ve bought a new heater and bought the temperature down to 25c. I’m still loosing fish. Should I take out the 3 fish I have left and treat with copper. Also what do I do with the tank ie do I change all of the water or do it gradually. It’s a 300 litre . Thanks .


