Well, since you have already gotten the talk about how Bettas are a tropical fish and need a heater, lets go over basics.
What is your water chemistry (pH, amonia, nitrate, nitrite, hardness, and so on)
What is the temp?
Do you do pwc and if so, how often?
Do you have a filter? If so, which one?
What does the fish look like? Are there any injuries, discolorations, sunk in belly, bloating, raised scales, or other changes?
How much does he normally eat? Which food? How much now?
Is he behaving abnormally other than refusing food? If so, how?
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Last edited by Bluewind; 01-03-2013 at 02:17 AM.