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Shoaling fish, which all tetra are, should be in groups, no less than six is usually suggested, but the more the better both for the fish themselves and to avoid trouble with other fish in the tank. You haven't mentioned the tank size, but it wold be good to increase the neon tetra to 7 or more, and if you keep the Red Eye Tetra it too needs 6 or more. The Odessa Barb is also mentioned, this too is a shoaling fish requiring a group of six or more--again, depending on tank size.

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