My 10 year old red tail died a few years ago. He/She was an incredible fish. I took a few years off, and am just now getting back into the hobby.
It lived in my outdoor, dug out, doughnut shaped, “natural” filtered pond. S. Fla. No liner, basically ground water level, filled daily in winter ( lower groundwater) by a deep well. 10k gal/hr pump through 2 bead filters, aerator, waterfall.
I found it floating one day.
I assume it ate something that obstructed it’s digestive system and bloated up.

It lived in my outdoor, dug out, doughnut shaped, “natural” filtered pond. S. Fla. No liner, basically ground water level, filled daily in winter ( lower groundwater) by a deep well. 10k gal/hr pump through 2 bead filters, aerator, waterfall.
I found it floating one day.
I assume it ate something that obstructed it’s digestive system and bloated up.

