The bristle/bushy nose plecos (Ancistrus sp.) are pretty neat fish-I have a breeding tank of the long fin albinos. Easy to care for and to spawn. (see pic in my album and 55gal NPT thread)
Good that you plan on moving it to a 20gal with real wood and plants....they need to rasp on wood to help with digestion.
I feed mine algae wafers daily and a shrimp wafer weekly-along with fresh blanched veggies....they love spinach, zucchini, green beans, sweet potatoes, cucumbers....I also keep wood outside in rain barrels to grow algae on that I will swap out every week or so-especially when I have a clutch of fry just coming out of the nest.