zebra danio:-think she's ill or worse:help

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mikecymru

AC Members
Jan 4, 2006
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:help: One of Zebra danios acting strange. Spends most of her time on her own. Swiming sluggishly. spending most of her time at the surface.
Cant see any spots or any other damage.

Ammonia 0, nitrite 0, nitrate less then 5, ph at 6.5 to 7.0.

Just introduced 3 more danios and 6 harlequins, could this have upset her or is it something more sinister. nAny advice would be grateful
 
I would think adding nine more fish at once would be upsetting. How old is she? Is she eating? My understanding of danios is that they zoom around and like the surface area better anyway My danios do that but they also do other strange things, like scuttle along the gravel looking for lost tidbits of food. One day I spent about 20 minutes looking for the smallest danio, convinced I had sucked her up with the vacuum. Gave up and looked for her the next day and there she was, as usual. I think your danio is just afraid with all those new tank mates and feels most secure bobbing at the surface. After adding all those fish watch for an ammonia spike though.
 
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