I know Mark (saintly) has kept them and seems to have had good experiences with them.
They are one of th emore aggresive tetras, so keep in good sized groups with no small, long-finned etc fish such as Guppies. Like jay said, they also grow quite large for a tetra (about 7-8cm maybe) so a tank of about 60cm/20gallons is a good sized tank for them. Nonetheless, quite an undemanding fish - obviously make sure your filter is cycled etc and they'll be fine with just the normal drill - weekly water change, flake food etc.
there a nice fish.i'd say put them in nothing smaller than a 3 footer visually speaking.
the aggression I've never had a problem with. there is obviously a ranking or pecking order if you want to call it that. and they pick areas to "sit" in. the odd nudge from a bigger fish but that's about it IME
I don't know if I would keep them with Siamese Fighters, but I've kept them with Cardinals, Rummy Noses, Ember Tetras and loads of others. The sometimes nipped my slow moving large gourami, hence why I wouldn't keep them with fighters.
I started with 8 and lost two to some mysetious face/mouth rot.... and another just died I now have five, and they are truely lovely looking fish and dont seem to show aggression toward my green neons or ottos not even during feeding. sometime I see the larger ones chase each other but thats about it. I will be getting 3 more when I go to my LFS as im told a min group of 6+ is best...
I had 10 in a 3 ft tank along with Clown Loach, Bristlenoses and Ram Cichlids and they were an absolute nightmare. Not with the other fish, with each other! They never shoaled, they each took a section of tank and just swam about. If one ventured into anothers space it was war. For about a week they did this and i had enough, so i scooped them up and took them back. Put on me annoyed/irate personality and demanded a refund or a swap - they obliged It was a total disaster for me.
IMO i would never go near them ever again, not unless i had perhaps a 4ft tankand i had about 50+ in there.