09-28-2008, 05:18 AM
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I would agree that your tetras need some company of their own kind. I have got black neon, blue neon, cardinal, black tetras, and rummy nose tetras, plus silver tip, and beacon fish in groups of 7-14 and they are all friendly and calm. Rummy noses are fast indeed, so are the silver tips, but the black neons and cardinals are slower, they keep to their own kind, however. The only problem we had was with the silver tips - their males were aggressive at first, but we got a bit more females and they settled down.
But you would need a bigger tank, of course.