08-13-2011, 12:25 PM
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Yes, this is a real risk that i suggest avoiding. As noted, it can go either way. Some Betta [we are talking the common Betta splendens, the Siamese Fighting Fish] are downright nasty, others less, and any coloured fish can be targetted. In reverse, most small shoaling fish will nip if tempted, and a Betta with long flowing fins and sedate swimming is a great temptation. When I was beginning, I had a Betta who ate neons readily.
A Betta is really not a community fish; a single male in a 5g planted tank is best for the Betta and the other fish in the community will be better too.
I recently posted an article on the 10 worst mistakes made by aquarists, and having a Betta in a community tank was high on that list.