actually i am deciding to get 3 otos since they have less bioload and they do just as good of a job. i also want a pair of bolivian rams and some cories, possibly a couple kuhlii loaches
Tha'ts quite a lot of "bottom dwellers" for that size tank.
I'd say choose between corys OR loaches. Even adding rams may be too much with the otos and corys/loaches but it'll probably work, but that would have to be it.