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I saw some Columbian Tetras at the fish store the other day, and figured they might be good "dither" fish for my four young Bolivian Rams. I went ahead and bought five of them. They are beautiful fish. Does anyone know much about them? They don't seem to like to school together all that much. And one of the bigger ones seems anti-social and chases the other four when he sees them. Is this normal behaviour for these kind of tetras?

yes

Are they the red and blue Columbian tetras? If so, you picked out a nice fish. They are one of the larger tetras, and have nice colors. If they aren’t schooling, it is probably because they are either exploring your tank and getting used to things (though tetras usually do that in schools), or are not afraid enough to school. Schooling seems to be a fear reflex, and tetras that are comfortable with their surroundings will not school, and sometimes even set up individual territories! It sounds like yours are exhibiting normal behavior, congrats on the new fish.

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And when he gets to Heaven, to Saint Peter he will tell: "One more Marine reporting, Sir! I've served my time in Hell."

there easy to keep n love flake n will b fine in the normal ram conditions but bolivian rams dont realy need dither fish but im sure theyll look great together

Yes, they are the red finned ones with a beautiful blue on their bodies. Really nice looking. And the Bolivian Rams basically ignore them.
The big CT really hassles the four others most of the time, and I am thinking maybe I should remove him. What does everyone think? Would that solve the problem, or would another just take over as the bully?
Thanks!

Chances are eremoving the bully wouldn't solve matters. He'd be replaced by the next one up in the hierarchy.

Getting more tets, so that the aggression is distributed among a larger number, would probably alleviate the situation a little.

I suspect your 'bully' is a would-be alpha male flexing his muscles. Give him some competition. If you have several beefy males of Tetras such as these (my Lemons and Beckford's Pencils are excellent examples of this phenomenon) then you end up with colourful males displaying to each other all day long. And if they have females to display to, you could even see some spawning action.

Another reason why "the more, the merrier" is a kind of Characin axiom for many species (Bruce Moomaw's Cochu's Blues excepted).

Panda Catfish fan and keeper/breeder since Christmas 2002

I bought the last three of these my LFS had. I noticed them bullying each other in the LFS tanks but since I got them home I haven't seen that one bit. Beautiful fish!! Nice choice. Mine haven't schooled since the first day I got them, although their "school" was never big to begin with.