04-18-2008, 01:16 PM
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I think I would want at least 90 cm for Rainbows, though 120 would be even better. This may be off the reservation, but Diamond Tetras have much the same shape and size as Praecox rainbows, though the coloration is much more a straight up silver than silver blue, and the finnage is a lot different. If you went with a small school of Black tetras, a slightly larger school of Diamonds, double that in cardinals, a bristlenose, you could probably put a dwarf gourami in there. (I'd say that you would want a 90 cm tank for 2, 120 for more on those as well.)
Alternately, you could go biotope and add a dwarf cichlid or two rather than the gourmis - Rams, Apistos, or Keyholes might work well.