09-29-2009, 03:15 PM
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Danios are shoaling fish, that is, they live in groups. When kept as only two, such fish sometimes develop different behaviours, aggression, etc. If you like the zebra danios and want to keep them, I would suggest adding a few more to create a small group (shoal) which would make them feel more comfortable. I realize you only have a 10g tank, but if you are regular in your weekly partial water change and don't overfeed, 3 more zebra danios will be OK. But that would be the limit in this tank. Danios are active swimmers, and a larger tank is worth considering.