06-14-2007, 09:09 AM
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With a betta in the tank, that puts the kibosh on ony sort of long finned critters: Gouramis and Angelfish especially. While I am sure that someone will pop up with the fact that they have been keeping Angels and Gouramis and a male Betta together for years with no problems, they will be the exception, no the rule. Also probably means that African Butterfly fish are right out.
For the surface, you might want to go with 8 silver or marbled hatchetfish. They get 2 1/2" long. You need 8 because they need to be in a group of at least 6 or they pine away (again, someone will say I have had 3 for 35 years and they're healthy as horses), and they can be delicate, so I would get an extra couple.
For the middle, rainbowfish or Congo tetras. Both of them get in the 3-4" range (Praecox(sp?) Rainbows stay smaller) and I think they'll be all right with a betta. Again, schooling fish.
The problem is that non schooling fish tend to be predators. Not compatible with bettas.