i was thinking of the yoyo loach, i have a 46 gallon, but already plan on keeping about 6 corys. i dont know if 3 more loaches would be to many bottomfeeders
I'd recommend keeping the yoyos in at least a group of three, they are a social fish and they will be much braver with a couple more yoyo's. Combining them with six cories should make for a very active and enjoyable lower part of your tank.
Yes, 3 would be good. As for bottom dwellers, as long as there is enough food reaching them, what you have there is not excessive. Drop a few sinking pellets or wafers in, perhaps just after lights out.