07-06-2010, 01:07 PM
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I concur with 1077. I personally would not have a betta in a community aquarium. They do better on their own, or with small bottom fish, in say a 5g well-planted tank. They are too much an easy target for many of the small shoaling fish like tetra, barbs, danios. Even rasbora have been known to nip in such circumstances.
A comment on your other fish, they need larger groups. Tetra should always be at least six, preferably a few more. These are shoaling fish, they occur in large groups naturally, and interact and feel less stressed in groups. Two or three does not constitute a "group" for their purposes.
Tiger barbs are not really community fish unless they are in large tanks with well chosen tankmates such as the lively fellow barbs, loaches for the bottom. In groups of less than 9 or more they frequently (=almost always) will turn aggressive and nasty sometimes on themselves but often other fish. While this may not look like much, it is highly stressful to the fish. The barbs are under stress because they are not in a large enough group, and the other fish are under stress because they are constantly in the "face" of what they perceive (via behaviours and pheromones released by the fish) as imminent danger and trouble, and in the aquarium they have no escape. Have a read of our profile of the Tiger Barb for more info.
Tetras in three's will do much the same; they can suddenly become nasty fin-nippers, and again that betta is too enticing of a target.
As 1077 suggested, returning the tigers, algae eater and betta would be a good move. And increasing the tetras (assuming you want/like them).
One other comment, shoaling fish do not "school" per say; they are often called schooling fish but this is something of a mis-nomer; they are shoalign fish meaning they need to be in a group, to feel comfortable and often they have interaction behaviours that keep them alert and healthy.
Last edited by Byron; 07-06-2010 at 01:09 PM..