06-25-2012, 11:53 AM
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Rummynose tetra are the most consistent shoaling fish I've ever come across (in freshwater). And with soft slightly acidic water, you're ideal for them. The Brilliant (Hemigrammus bleheri) is the most colourful of the three species, and the one most often available because of this.
Some of the other named tetra are fine, but can be nippy, so be careful; this is mentioned in our profiles. And gourami can set this off even in otherwise peaceful characins. As Neale Monks wrote, tetra have a lot of teeth and they like using them.
On other small shoaling fish suited to your water, look at the pencilfish; these will remain more in the upper and mid-level, so a nice balance with tetra like those mentioned that tend to be mid- to low-level. Also for the surface, hatchetfish. And the rasbora in Trigonostigma [there are three similar species, all are in the profiles] are excellent "schoolers."