hi i need some help with my discus.. i have one that fins is clamped and didn't eat.. i don't know the reason why, but the couple of weeks ago, he ate really good.. anyways, before i did a 10% water change yesterday.. i forgot to turn back the heater on for about 5hrs. this is i remember before the signs of fins clamping occurs.. even though the temperature is back, he is not back from his normal diet.. his fins still clamping and didn't eat, and he stays in the corner.. what should i do with him? should i treat him alone or treat the whole tank? can anyone tell me what's going on with this guy? and what is the first step that i should do to help this guy back up to normal again? sorry for all the questions guys, i just don't wanna lost this guy.. any input will be appreciated.. thanks for reading!