My Red Devil is acting funny...help!

[STONEDFISH]

I have a three year old Red Devil. Currently it has been laying on it's side near the heater in it's tank quite a bit. When you approach the tank it'll come to greet you, but as soon as you leave it goes back to it's spot by the heater. The tank is 78 deg so I don't think it's cold. It had some kinda fungus a couple of weeks ago, but i treated with pimafix, so I think that's gone. Water params are normal. Any guess?
stndfsh

 

[Sym]

Maybe he is cold? I have a red devil and my tank and I keep it at 82 in the winter and it goes to probably 84-85 in the summer which is beyond my controll but my devil is really happy in there, Id suggest cranking it to 82.

 

[squirt2005]

I don't think he's cold. 78 is fine. I know that some medications interfere with biological filtration. Recheck your testing and do a large water change. If he doesn't perk up add in a couple "i don't care about these" dither fish. That nearly always helps.