depends on footprint, tanksmates, what type of dat, and what size you get them at.
im assuming 60x18, and if you go with a NGT, NTT, or AT you'll be good for life. an IT or ST you will need to upgrade to a 24" wide eventually but that will be quite a while.
i've had multiple and they didn't like each other. with cichlids mine is very peaceful.
as far as food, mine started only taking bloodworms, worked up to krill and shrimp, and will now eat pellets. some have luck with pellets, others dont