It won't hurt nothing to try, I tried feeding my last P them and he didn't bother w/ them, though he was a 4 inch rhom. Depending on your gravel and decor, they are tough lil bastards to see, I know I had a helluva time looking for them because I wasn't sure if mine ate them or not. I read somewhere though that they are like 90+ percent water, so its not the most nutrional thing to feed. Just make sure if you try, to keep up on your gravel cleanings, because if he don't eat them whole, and your pleco don't clean them up, they again will be hard to see.
If you are looking for small live feeders and preferably one that are cheap get some feeder guppies... you could even set up your own feeder tank were you could breed them yourself instead of taking trips to the fish store, plus these are not difficult to breed either :