tight schoolers.

My embers follow each other around all the time, though there's only 4 so I don't know how they'd school in an appropriate group. My emerald eye and harlequin rasboras school usually, most of the time at least 5 of the 7 emeralds and 4 of the 5 harlies are schooling. My rainbows are great also.
 
My embers don't school very much, but they don't have anything to feel threatened about (the biggest fish in the tank is a sparkling gourami). My rummynose tetras are very close schoolers. My pgymy cory cats also school very closely, but mostly stay at the bottom, though sometimes they join the ember school.
 
Anchovies school into tight balls when being chased by dolphins. So do herring. LOL. In my experience cardinals don't school much neither do neons. You should go to your LFS and watch some of the fish in their schooling behaviors.
 
Anchovies school into tight balls when being chased by dolphins. So do herring. LOL. In my experience cardinals don't school much neither do neons. You should go to your LFS and watch some of the fish in their schooling behaviors.


Maybe a Baby Whale in the tank would make them school better... (real freshwater fish)
 
From my tank:

9 espei rasbora: Very tight school always
12 Strbai Corys: Not a tight schooling except PWC
6 neon & cardinal tetras: Not a tight schooling except PWC

During PWC, strbai and tetras are schooling very tightly due to thread from gravel vacuum. :)
 
my rummies school very tight, as did my diamond tetras (RIP). I think the key is having at least 1 fish that is larger and scarier, in my case a gold gourami. I don't want to say threatening because I've never seen him display ANY aggression; he mostly hides in plants. That's essentially the key, though...someone that puts them a bit on edge.
 
My Giant Danios school pretty tightly, but it's mainly a whirlwind of twists and turns. My Harlequins are very tight. I've been very happy with them. My Tiger Barbs are constantly in pairs or trios.
 
AquariaCentral.com