sure... just be sure to make regular water changes to keep the nitrates at a level the fish can tolerate... also so as not to promote too much algae growth... you may also want to consider some powerheads for additional circulation... I know my 30 needed them..
just be aware of your levels and dont add too many fish at once...
Yes, I have a 29 running with just a biowheel on it, and it has done quite well. And I would also encourage using powerheads, my tank ran rampant with algae without them.