Safe fish tank temp?????

New member
I have a freshwater tank with tropical fish. The temp is normally always 78 degrees. I live in the midwest and it's kinda hot here and we do not have our air on. I've been keeping fans on it for the time being and it's reached 85 in there. What is the hotest it can get for the fish to still be safe?
It's a 46 gallon bowfront with a 65 gallon filter and 2 decorations that have the bubbles.
 
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