12-30-2012, 01:09 PM
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I concur with what Quantum has advised. And on the Bloodfins, all species in this genus tend to be feisty, to use a "kind" term, but this always means the possibility is there for this to turn nasty. And yes, the so-called Dawn or sometimes Panda Tetra, Aphyocharax paraguayensis to give it its accurate name, is a terror unimaginable in so small and pretty a fish. Twice I've tried this fish, but they are stand-alone in their own tank. Many horror stores can be found among aquarists. I would be careful of any species in the genus.
As you have a good sized space, may I offer a suggestion that you re-think the fish species entirely. While sufficient numbers and space can mellow the Serpae and Black Widow/Skirt, you are restricting other options with these fish. There are many colourful tetra and other fish within the characins that will live peacefully, but adding even one of these questionables can upset the applecart, so to speak. There can be no hard and fast rules, but there is "normal" traits and it is best to assume these rather than hope for something contrary to the norm and risk the other fish.
We have many tetra in our profiles, and there are the closely-related pencilfish and hatchetfish.