Hello everyone. I am in need of a schooling fish for my 55 gallon planted tank. I already have 9 zebra danios in it and all as they seen to do is spread themselves out as much as possible. I know this might sound weird but it just doesn't look as appealing. I would like a schooling fish that is about the same size as a danio and would not be aggressive, if anyone has any suggestions on a fish that would be great.

you can add a few serpea tetreas, red eyed tetras, or some neons as well

i know you say not aggressive. i would say put in about 6 odessa barbs. 2 males to 4 females. the males are awesome. they are not really that aggressive. i have them in with 8 rummy nose tetras and they don't pay them any mind. it should also get your danios to school since they might consider the barbs a threat.

Harlequin rasboras or rasboras heteromorphas bad ass they stick together better then neons or some bala sharks but need a huge tank for that

I like my pristella tetras too.