hmmm.. depends on their nature. i kept a few smaller convicts. the males are very territotial and will chase, and i mean chase, anything smaller than them. they terrorized my swordy and molly. they left my pink convict alone as she was a lot bigger.
i found some fish that were okay they are giant danios they are bigger than the convicts and much fast so they get along nicely till i get the bigger tank in 10 days woooyey!