10-29-2006, 05:05 AM
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Congo Tetras are African. And loaches of any kind won't fit in an Amazon themed tank. It depends how truly authentic you want to be. :) Khulis prefer cooler temperatures than a Discus set up would run at (unless of course you can source some definite Acanthophthalmus semicinctus, which are often missold as Khuli Loaches.)
55 gallons is on the small side for a Discus tank in all honesty. It's the bare minimum I would recommend for keeping them. So if you do decide on Discus, keep the tank mates to a minimum. Dither fish and perhaps a few Cories (choose a species which is happy at Discus temperatures) for the lower regions of the tank.