07-13-2011, 11:47 AM
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They need a larger group. Minimum with danio species is 6, but as you have room, more is better. Shoaling fish occur in large groups and have a need for that, so the more the better. They also need "security" like plants, wood, decor around them. Gwen is quite correct, they are probably reacting to a new environment, but the stress can be reduced by providing what they "expect" naturally, namely more of them and some cover. And long-term to be really healthy, this is mandatory.
You can read more about this in our profile, not sure which danio you have but it is probably in our profiles; second tab fromm the left in the blue bar across the top. Danio are cyprinids so they will be listed under that category.