Emperor Blue Hook lost control swimming

[Censis]

Originally Posted by LauLanChu

Not sure of life span of this fish. That is why asked you how long you keep the fish, from small or already adult when first kept. Aged fish more prone to sickness and accident injury. I see you having more sensitive tank mates and they are okay, no reason for the hook which is more hardy to die if there is other issue like upkeep.

I bought them already big about the size of 12-13"..
Kept them for over a year with me from that size onwards..

Yes I have a pair of stingray and peacock bass in the tanks as well.. So it could be the fish itself?

[LauLanChu]

I searched and gotten life span is more than 10 yrs. So also don't make sense unless in captured environment is different.

[Censis]

Originally Posted by LauLanChu

I searched and gotten life span is more than 10 yrs. So also don't make sense unless in captured environment is different.

Hmm.. Then not sure why too.. Kept for over a year but all started dying one by one within the span of one month..

[LauLanChu]

Probably is the knocking or some kind of plague that only affecting this fish type.