My favorite type of fish are the loaches. I absolutely love their personalities! I have succesfully kept YoYo's with Gold Zebra's with Khuli's all happily in a 55 gallon tank. Most loaches get along fine with other species from my experiences and what I've read.
HarpoGarza: I think it's cool that you like loaches and bottom feeders, but your 29 gallon tank is way overstocked, I hope you plan on either putting much of the fish into bigger tanks or at least not planning on just keeping them all there. Think about this, a standard 29 gallon tank is roughly 30" long, 18" tall, and 12" wide. You have 5 Clown Loaches who (if not getting stunted) will grow to be about 12" long so 5 of them may be a good school to have them in, but think about just the space they will occupy at the bottom of the tank. Then 9 YoYo's? YoYo's get to be from 4-5" long so 9 x we'll go 4 is 36" of YoYo Loaches who will fill in the cracks between the Clown Loaches. Now you've got cories and Colombian Sharks? Just take that into consideration. I'm not trying to start a fight, but being a good fish keeper you shouldn't plan on leaving them all in there.