Our Crowntail died tonight and i'm trying to figure out the cuse of his death.
He was a really energetic fish up until we upgraded him to a bigger tank and introduced a filter, after that he stopped eating then just got really lethargic and just started floating.
It was like he was unable to dive everytime he tried he just floated right to the top again.
Can anyone give me an idea on what we did wrong?? Thankyou.