05-06-2012, 11:17 AM
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The existing fish will limit almost any addition. The bichir for example will grow over a foot and eat anything that fits into its mouth, so there would go the butterfly fish. I would also not have something as beautiful and sensitive as the knifefish in with the bichir and ropefish.
Building the tank around one of these would be more likely successful, which would obviously mean removing the other two. For instance, a lovely display around the Black Ghost Knifefish, with a group of angelfish, suitable catfish, dim lighting, lots of branches, sand substrate with dry leaves, and floating plants could be stunning and true to the fish's natural environment.
"Ancient" type fish are basically unique in themselves and thus should form the centrepiece rather than attempting to compete with similar fish.