Today I turned down the air up stairs, not thinking. My 5 gallon got up to 86 degrees. I have since unplugged the heater and turned up the air (my room got up to 81

). Should I be concerned about my fish? He seems okay... Also should I try and drop the temp more slowly?
Oh, I just had to tell some one this... Today I was at my local fish store and noticed an employee telling a woman that a koi would be fine long term in a 20 gallon.

When the employee walked away for a second I when up to her and said "Mam, I wouldn't trust everything you hear from this store. Koi's that size need about 200 gallon." She seemed thankful and even asked if I knew any place more knowledgeable. That was about the time that the manager asked me to leave the store because I was 'chasing away his customers'. Turns out the employee had heard what I said and went to get the manager.

But at the end of the day I didn't care because the woman didn't buy the poor fish.