Hunched Harlequin

[Noahs ark6]

Hi

I've got 6 harlequins in a 60 litre, one of them has a curved back, it happened over night about 1 week ago, he also struggles to stay in the middle of the tank and floats upwards, could that be swim bladder?

thanks

 

[Kelly-Jo]

Possibly, has he been exposed to any dramatic temperature change? I ask this because sudden temperature change in water from warm to cold can cause spinal curvature.

 

[Noahs ark6]

not that im aware of, but the heater is extremely old and may be unreliable (about 9 years old!) it may be faulty, should i change it? i'm guessing theres no way of correcting the curviture?

thanks