Swimming Tail Down

[busterbrit]

I just added my fish to my tank after 3 months of fishless cycleing.

Fish seem to be doing well but the fancy zebra danio is swimming tail down. Once I saw this I turn the kitchen light on to take a better look and he seems to be doing a little better but something is off.

I only have had them in the tank for 6 hours.

Any thoughts?

 

[OldMan47]

I don't have any immediate advice. Can we know how you went about adding the fish to the tank and how many you added to what size tank?