Call me overcautious, but if I were you I'd get a couple of mystery snails. They do a great job of cleaning up, and won't be nippy on your betta's fins--a tempting treat for smaller AE's. The Siamese Algae eater is pretty good, but you need to ensure that it is an SAE and not a Chinese Algae Eater, which can be quite aggressive even as a juvie. Pl*cos' get too large for the most part; the smaller species, from what I understand, get lazy. Just make sure that what you're putting in there will do the job, I often google for starter information. This is just from my own experience, for what it's worth. And the snails are entertaining, believe it or not. JMHO.