Nestquick, i dont think you understand how important it is to get a bigger tank...
It is animal cruelty to keep a fish as big, fast growing and as messy in a 10 gallon!
It is cruel to keep him in such a small tank if he is much more than 3 inches...
Why keep an unhappy fish that you know is suffering, when you can keep a few small happy fish darting around in that lovely 10 gallon?
If you can find a 70/75 gallon in the very near future, and set it up, it will all be sorted. And you can still set up the 10 gallon nice as suggested...