Are telescope eyes prone to swim bladder disease?

My black moore recently died. He could no longer swim, and he laid on the bottom of the container I had relocated him to, on his back, for a few days before he finally perished. I refreshed the water each day, because I wanted him to have oxygenated water. His swim bladder disease had progressively gotten worse over the past 6 months or so, as he was always sucking air from the surface of the water. I have a Fluval canister filter and an airstone in the tank, so all I could think is that it was just a bad habit of his. His tankmate doesn't suck at the air, and doesn't have swim bladder disease. And once or twice a week, I gave them peas, and I tried to fast them every so often, hoping to clean out his system.

Anyway, I was at the pet store today, and they had a tank of beautiful telescope eyes. Some of those fish were floating upside down. It makes me wonder if telescope eyes are prone to swim bladder diesease. Any opinions?

He couldn't swim anymore, so he kept being sucked into the filter intake. I would use the net to move him away from the filter, but not long after, he would once again be held against the filter intake. It seemed like an uncomfortable way to live, for sure.

Oh, well that makes sense. I know fancy goldfish have that problem, but when I saw the tank of telescopes with many of them floating, I thought maybe I should stay away from them for good.

Thank you for answering!

That is really sad... how cruel.