02-23-2008, 11:47 AM
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Lupin is correct in saying that your tank is too small to support a school of these fish, but zebra danios are a hardy, readily adaptable fish. I don't think that it would be necessary to return them and would probably think it ok to get a couple more to put together a mini-school. But, in doing so, you must realize that the tank would be very close to its maximum limit of fish. It will certainly allow the fish to school somewhat. It would also give you an idea of what size tank to get in the future.
I recommend you upgrade, instead of a 10g, to a 29g. For just a few dollars more, you can get 3x the tank and 10x the enjoyment. And the larger tank would allow you a much wider selection of fish and options.