gill

I'll add fish I have Had

Rasbora dorsiocellata - Very Cool and Exceptionally Hardy. Realy like how they go Bronze color after eating.
Glass Cats - Always swim in a nive V Formation
I don't think i have noticed these mentioned so far but - Gold White Clouds
And Also Threadfin Rainbows.
Pygmy Cories always swim along together.
Glolight tetras are very nice.

I have recently seen ember tetras and might try them as they are under a pound each ATM

Adragontattoo

not exactly schooling but my (approx) 2" keyholes all make sure that they can at least see each other during the day and if they get spooked they WILL group together.

Between the 2 flagfish and the monster Ram (biggest ram I have ever seen) I have, these are confused little cichlids that think they are scavengers and a schooling fish.

I know that it really doesnt count but I still laugh every time I look at that tank.

On topic,

My rainbows all school together (1 boesemani, 2 Turq, 3 Salmon Red)

Dracolique

I keep Royal Cobalt, Turquoise, Red Snakeskin, Scribble and Pigeon Blood Discus along with common Neon Tetras and German Blue Rams. I dont think anything beats that for a planted tank.

trebalack

I have royal black emperor tetra, they have the yellowish lining on the fins and tail with black stripe on the body. There eyes has an outer lining of glowing light blue. Awesome school fish for planted tanks.

- T

pasd

Emerald eye rasboras (Rasbora dorsiocellata) has got to be some of the best schooling fish I've kept. They really stay in a tight formation at the top of the tank.

DanD5303

I'd second the emerald eyed rasboras. They school even when not under stress. Gold tetras do pretty well, and rummy nose. Dan

Jessie

I'm going to reinforce someone's previous mention of Diamond Tetras. Perfect for larger tanks, they're always tightly shoaling back and forth -- really dazzling.

MorningShade

My best schoolers are my redline rasboras, they're always together no matter what. Not the showiest fish or the most active though, even when they're not stressed they usually just hang out together all pointing in the same direction not doing much.

iek

Exactly the same i can say for mine:

Hyphessobrycon amapaensis

(http://www.aquahobby.com/gallery/e_H...amapaensis.php)

davemonkey

SAE's are my favorite so far; they not only look good in a group, but they 'earn their keep'.

Also Bleeding Hearts.