[Yokuutsu]

They're not that much smaller....because Males and Females will fight each other-like in a tank with multiple females, they establish a pecking order...which is why you need an odd number so one can be the bottom, one can be the top, and someone in the middle.

They like having places to hide...do you have any of those little cave thingy majiggers? XD If not, seaweed would work with enough of it (one with it's head popping out from behind it with bits of its body being seen from behind the seaweed.

Dunno if that's possibly but I HAZ IDEA! XD

Edit: And bettas don't like current so no waves in mine is perfectly find -nodnod-