hey everyone i need some suggestions of types of food i can feed to my eel and oscars. right now i am feeding them pieces of frozen shrimp and i think they are getting bored of it. blood worms wont work because my fish eat alot! i feed them night crawlers sometimes but its to expensive and i cant find them wild in las vegas

so does anyone have any suggestions for me?

so does anyone have any suggestions for me?
... iono maybe ill just keep my tank stocked up with ghost shrimp so he can eat them when ever... good?