I have 3 females in a Sterilite Showoff container(clear kind with blue lids). One is a light blue double tail, the other one looks like a miniature Bass, and the other big girl is yellow-white. They will all line up in the corner of the tub, look at me, look at each other, and look back at me... It's pitiful... I also have a 10g filter attached to it, not too much current for them(even though they seem to enjoy playing in it). It keeps the tub nice and clean.