Strange behaviour

[steveyp]

Hi all.I have 45 gallon tank. Water Quality perfect. Have 5 zebra danios and 5 cardinal tetras all active and happy. But have 1 zebra who staysnear the bottom and swims back and forth in the corner. Did this when they all just went in the tank then acted fine swimming with the others now doing this again. Doesn't look sick just stays alone swimming back and forth as described. Is this fish sick or just a loner.? Would appreciate any insight.

 

[Calypso77]

What does water quality is perfect mean? Do you have numbers at all? Are trates on the higher side of normal or lower side? Usually most times a fish acts like that specially such and active fish usually there is something wrong. How has his eating been?

 

[steveyp]

Hi ammo is 0 nitrites 0 nitrates 5. Was eating but not when I fed them tonite. Showed no interest.

 

[Calypso77]

Ya I would say there is something wrong with him then.