Manic Fury
Aquarium Advice Activist
My harlequin love swimming in the filter outlet
I heard this from other places too. Do they really seem like they are playing? I read on one person's post that one of their harlequins would launch itself across the tank, and then go back and do it again.
That's good news then. I just wish they would swim around more. They seem to only stick to one side of the tank together.