Ooo yay I wish my boyfriend had an interest in fighters, he doesnt really show an interest in my fighter fetish, but after dragging him into a fish store he has since declared that he wants a Ghost Knife fish and Butterfly Pantadon...getting closer I hope.
I have my fighter in with some girl fighters, Pictus Catfish, Goldfish, Bristlenose, Blue Rams, some loaches, goldfish and a lone angel, its partner died:( People's experience with Angels and Fighters vary, what I was taught is that Angels and Fighters dont mix, but I personally haven't had a problem. I think that it is depending on the Angel, environment and fighter, and how they interact. Most Tetra's are fine, I like to stay away from the notorious fin nipper types (Barbs, Red eye Tetra, sharks can be a little problem when bigger).
You can only have one male in a tank as a general rule, but depending on the size of the tank, (large and heavily planted, some people can get away with two in one tank. I would stick to the one per tank Fighting wise, they spend most of the time flaring and showing off and (this is going to sound weird ) hitting eachother with their bodies (thats is what it looks like, from what I've heard, a weird way to describe it I know,) most males will shred their opponents fins to get them to backdown, (but they dont outrightly go for the kill), I dont know how true this is but I have heard that the victor eats the remains of the shredded fins, more often then not fighting does tend to end in the death due to stress. Girls however are alright in groups of more than one, they probably will still have their little flaring and show off matches as mine do, but not to the extent as males do. If you were to keep a male and females together, I would stick to a small amount of females as you dont want the male being hen picked and driven to the local battered husbands shelter
However, other people will probably have differing/varying opinions on Siamese Fighter Care, this is just what I've read, understood, learnt, experienced and discussed with other Siamese Fighter keepers and I look forward to seeing the views of others.