I think that 15 fish would be to much. Less than 10 Cobue all up might be a little better but i'm not sure how they would go in a small tank like that.
I think your best bet would be 10-12 Ps. Saulosi. Vertical barring, attractive females and of course males and they are very social. Single species tank you end up with a blue/yellow combo
I think your best bet would be 10-12 Ps. Saulosi. Vertical barring, attractive females and of course males and they are very social. Single species tank you end up with a blue/yellow combo