[judya]

Why kill him? He's alive, he's eating well, any health issues (except the blindness) will be improved by a good healthy tank. If you can spare the tank for him. Most gold fish are little eating machines, so if he's eating (he's a big eating machine!) he's doing what he's supposed to. Besides hand-feeding, if you put the food in the same place every day, he'll find it.

I would probably not put him in with the others, as he may have something contagious - it's hard to say. Most of his problem is the terrible conditions he's lived in and now you're giving him a better home.

I wouldn't keep the African unless you like him - they are more agressive, and as you've found out he and the rafael are territorial. However, depending on species and whether it's male or female, some Africans are incredibly beautiful. But unless you really want him, I'd try to find him a diffferent home.

Also many Africans appreciate rockwork in their territory, so if you have extra rocks make a loose mound in one corner and that will give him a better territory.