How many fish do i feed my baby red ear slider?

I have a baby red ear slider. hes about 1.5-2 inches long. recently, i have started feeding him feeder fish that are 0.5 to 1 inch long. should i keep feeding these to him? he seems to have no trouble at all catching them and eating them. and also, if a put a large sucker fish that was about 5 inches long to clean up the turtle leftovers, would my turtle try to eat or attack him right now?
Answers:
Yes, it's fine that you're feeding him this as long as you don't just feed them this. You need to also give them a staple food, pelets (ZooMed's and T-Rex make awesome pelet food, Wardleys and ReptoMin are ok but don't have the same amount of nutrients that all turtles need, especially when they are babys). As far as the amount goes, I'd put about 10 in the tank and see how it goes. They'll eat the fish as snacks. My adults eat about 5 fish a day if not more plus their pelets. Fish amount is really up to how many you want to put in there. If you were to add a sucker fish now, you should be fine but later on your turtle might eat it. You could also add snails. They have a finer chance of being eaten by your turtles (still happens sometimes) and last forever. Right now you're almost safe with any type of tank cleaner but once it grows to 3 or 4 inches then nothings safe (basically).
If keeping the tank clean is your second concern, add some ZooMed's Repti-Safe which helps with pH, cloramites, etc which is really good for the tank (keeps it clean and the infamous turtle smell that most inexperienced owners encounter).

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well i think it is wrong to feed live animals to other animals why dont you try a non live food and you might get some answers or you wouldnt have this problem

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Britt (the one who commented above me)...what do you think animals in the wild eat? Even yourself, do you not eat food that was once alive? Even if you are a vegetarian, are those plants not living things? Some people are MORONS!...

If the RES is doing fine catching the fish, then I don't see a problem with feeding them to him...You may want to try some that are a little larger because these may be too small and he will eat them all at once. As for the sucker fish...I don't think he could eat him due to the size, but I'm not sure I'd put one in there. I've never heard of anyone doing this.

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You'll want to feed insects as well, such as crickets and earthworms. A high protein diet of fish will cause pyramiding of the shell. Add plant matter as the turtle grows.
The turtle will probably try to chase the sucker. He probably can't kill it yet, but if he does, so what?

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Yes i think you should feed him fish after all he or she is still a baby.I don't know it will eat the other fish.Britt is wrong.After all maybe she ate meat once in her life and anyway turtles need meat.Catching fish gives the turtle exercise and food.Oh and I forgot it helps them with hunting ,like if it were in the wild.