the longest i have kept one was for 9 months. it loved eating both live and frozen worms and shrimp. i find it kinda hard to treat them if they get any fungus or fin and tailrot cause they are scaleless and very sensitive to the water conditions. They like VERY CLEAN, colder water and are very social. It is cool when you see six or more of them together (if you can afford it, i couldn't). a school makes a bug difference in their activity level, probably increases chances of survival too (not sure, but that's what i think).