When you say albino pleco, do you mean the standard common in albino form, or an albino ancistrus? Neither are, in my experience, that good with discus; the former get too large and the latter can get aggressive when it comes to seizing the discus' side and having a snack.
I would go with cories. Sterbai would look great. No angels or clown loaches; the latter are far too active for discus.
I would go with cories. Sterbai would look great. No angels or clown loaches; the latter are far too active for discus.