So even IF this happened, it wouldn't happen for over a year. But my friend started a sorority and her fish are lovely and getting along so far. And I'm drooling (dont tell my male crowntail, Frazier know!). But with Petco having $1/gallon sales and me just having bought a bottle of ammonia from Ace. I am wondering if I did a betta sorority would a 20 long or a 29 gallon be better? Could I do a school of cories as well? I'd ideally be getting them from my LFS so they'd all come from the same tank.