They're growin'.That's a nice tank you got. Maybe add some taller plants...?
I love my Harlequins too but they love the back of the tank more than they do me.
On a side note, the Porkchop Rasboras (very similar to the Harlequins) share the same tank and they don't school with the Harlequins. They are more "free-floating" than schooling.