09-13-2010, 02:55 PM
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The cardinal tetra is the only questionable fish in this group; both with respect to water parameters as tanker mentioned, and its rather slow, sedate level of activity. Both barbs are active swimmers, and the cardinals will need quiet space under plants--they do not like the open, nor light; my group in my 115g are always at the end farthest from the filter (they also do not like water currents), under and within plants. They surface to feed.
And you're correct, there are no surface fish in your selection. Surface fish are not easy to find. Hatchetfish are the best; if you stay with the barbs, I would suggest the plain but larger hatchets like Gasteropelecus sternicla or G. maculatus, or one of the two species in Thoracocharax [the first is in our profiles, clickon the shaded name] as the Carnegiella species are too delicate for active lower fish. Some species of gourami spend a lot of time among floating plants, but don't put gourami with such active fish as barbs.