When can i put them together...

[sully]

I have a 3 inch gfp leucy and a 6 inch leucy but my big guy looks like a giant compared to the little one. what size should the little one be before i put them together?

 

[keiko]

General rule is that the size difference should be max 2 inches. But with juveniles I'd be even more careful and with adults a bigger difference can work well.