Live foods, healthier fish?

Have a question. I have had three goldfish that have died, all started
with bladder problems and eventually died with pine-coning. I have
kept fish for years the tanks chemistry was good etc. etc. No obvious
problems, all the fish lived healthy for at least a year before they
became sick. Died at different times too. Not sick at the same time.

I recently read something suggesting that live foods made for healthier
Godlfish, especially when it came to swim bladder health . I wondered
if anyone had any experience with this and if there was anything to
this?

We have sworn off Goldfish because of our experience. I have kept fish
for years and never gotten attached to fish. But the Goldfish we had we
got quite attached too and it was not fun watching them get sick and
eventually die.

Kudzu