like i said before, if it is only a snack you want to give to your O, it's cool and any small fish can be bred for that purpose.
If you plan on feeding feeders only, you are gonna need an extra tank and fast growing, quickly reproducing fish.
I gave up the idea for now, for all feeders become pets in the end.
And allthough i keep predatory fish, i do not enjoy the suffering and stress part on the fish that is going to be eaten.
I think buying a kilo of smelt is a easier option.
And there's a difference in the "Swallow-whole" feeding tactics of an oscar, compared to the "shredding" that my gar does.
This is not a nice sight on living fish and if possible i don't resolve to feeding live fish.