Who can tell me whats wrong?

  I have a betta fish and I think he may be sick. Symptoms include: not eating, barely moving, staying at the bottom, not responding to surroundings, clamped fins, and dull colour. I change his water one a week and feed him once every other day. I thought his water might be too cold, so I raised the temperature to 78 degrees Fahrenheit. I'm not sure if that has helped tough. Please help !!!!
That's a easy question. Your betta has got a chill, because you say that "I thought the water might be too cold". What was the temperature before you raised it to 78% f.
Check your betta for fuzzy white stuff it could be fungus but he might hav scarlet fever if there r ne other fish remove him or her and go online for the symtoms and how to save him my betta had scarlet but I fixed it
What size is his tank? What are the readings for ammonia, nitrate and nitrite? Did you cycle his tank?