is 86F too warm ?? my temperature is a stable 86F.

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It depends. How are the fish acting?

Some fish can handle it some cant, best way to see is to monitor them.

I have recently treated white spot in my tank and cranked tempature up too 86, fish dont seem to mind it so I am leaving it at 86 to prevent it.

I also have corys and they seem fine with it, but as I said best thing to do is monitor them and make sure they are not gasping for air.

Hotter water does not hold air as well as cooler so I had to add a extra air pump and stone.
 
You shouldn't keep it that high just to prevent the ich. If you get the ich turn it up and add a little salt, half teaspoon per 10g. No need to have it kept that high. Angels and Cory Peter 76-80
 
I cant add salt to my tank, too many fish that xant handle it
 
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