I saw something that surprised me a bit the other day. I was at Atlantis Aquatic Gardens, an lfs in Terre Haute, In., and they had a pair of Dovii with fry in a tank that I would estimate was no more than 100 gallons. The male is at least 20 inches (with great color) and has been in that tank for more than a year. The female and fry were a new addition. I was just a little surprised to see them breeding and looking quite healthy in such a relatively small tank. Most everything I've read on here suggests 200-300 gallons at a minimum, and for Dovii that size most suggest something much larger. I've never kept them, but found it interesting to see.