08-12-2011, 11:43 AM
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A Betta (i.e., Siamese Fighting Fish species) should not be housed with other fish, except perhaps some substrate fish. Betta sometimes take a dislike to certain fish, due to the colours, or just being naturally aggressive. In reverse, many even peaceful fish like tetra can nip the fins of Betta. Betta are slow, sedate fish and the flowing fins is quite a temptation. It is not recommended that Betta be in community aquaria. Even when no physical interaction is observed, the fish are sending out pheromones or chemical signals, and this alone can be very stressful to the other fish. Think of it as if the Tetra are all huddled together, thinking, "wow, look at those fins, wouldn't it be nice to chomp into them?" and the Betta can read their thoughts.