I tried 3 with no success. I believe I would have had better luck if I kept them in a community tank. From what I have been told, they are not nearly as hardy as a regular JD, don't grow as big and grow very slow. I kept mine with a parrot,blue acara and a datnoid and apparently they stressed out the dempseyenough to make it die.Though, I never saw any of them be aggressive towards the dempsey. Don't bother unless you have a community tank and have $$$ to experiment with(or buy from a store with a 7 day return policy)