fish randomly dying please help

[Byron]

I
there's been a misunderstand I don't take all the water out I do 50% and I am well aware of ammonia poisening as my goldfish have had it in the past

do u think it could be nitrate poisening because I read when they die they get an arched back

so treatment wise what do u suggest

Diagnosing disease is extremely difficult when it is not something obvious like ich. Spinal curvature can be caused by several things. The best "treatment" now is a larger tank and clean water. But the three minnows may still die from the past problems. Internal damage once caused is not going to reverse.

 

[Byron]

Just to point out that 24 inches is 60 cm not 30 cm. I would not like to see anyone just looking at the metric size and getting a tiny tank

Thanks Sue, my early morning half-asleep mistake. I'll edit my original post.