*imitates LFS owner* Sure, you could even keep them in a 10 gallon, for LIFE!!
Seriously though, I agree with all posts above me...not a chance...just wait till your RBPs are bigger, they'll start snacking on your loaches.
If you had a single one like mine, who has a physical handicap, you MIGHT get away with the loaches, but since you have a shoal, not a chance of them living to their lifespan....unless you're really lucky, or your fish are dumb.