I have 6 snowballs in a 2.5 gallon (looks just like the 10 gallon only smaller
) next to my bed for about a year. No breeding going on as they are all males. Sand substrate, little bitty log we found at the lake, and some java moss and bits of marimo ball make up the tank. Small, but everyone is happy! Also doubles as a place to put endler fry in when necessary.