Oto's are good algae eaters and the Dwarves ought to be okay, they're not as aggressive as their larger brethern. Shrimp and snails are good additions too. They'll clean up a lot of detritus.
Other fish, hmm. Tetras, Platies, Guppies, Swordtails, female Betta*, Danios, pretty much any small schooling fish except Tiger Barbs and other semi-aggressive schoolers.
*Not compatible with Dwarf Gourami