So last week I had 2 fish die in my tank from ich. A clown and a trigger. Prior to that I had a sailfin and a angel also die which I believe was from ich also. I don't have a qt tank so I was reading about the high heat method. So for the past week I've had my tank running at 88.7. My remaining fish which are a clown, goby, damsel and foxface are showing no signs of ich and are swimming peacefully and appears stress free. Should I lower the temp now? Or keep it the same for a while longer?