Originally Posted by LebronTheBetta
For feeding, it depends on your pellets. 6 should be the maximum for a day if your pellets are micro sized.
Agreed, 10 pellets a day is way
too much for a normal-sized fish. Even my giant only eats 8 per day total (and sometimes less than that).
Get the temperature up to around 80º, ditch anything "medication" ending in -fix, and up your water changes to make sure his water is pristine. Oh, and don't forget to add water conditioner!
If you can, take a sample of your tank water to a pet store and ask to have your water tested. If they test it and just say "Looks alright," please ask for specific levels (pH, ammonia, nitrite, nitrate, hardness, alkalinity) and let us know what they are.
To me, the photo, along with the description sounds like a combination of overfeeding and poor water quality. Once you get both of those under control, you should be good to go.