Rats! I’m very sorry to hear that your beautiful Pinto did not survive this episode of gas bubble disease, sir — all my condolences on your loss!
But it’s great to hear that the male Sunburst is responding to the Diamox treatments much better thus far. When problems with positive buoyancy and pouch gas keep recurring, simply evacuating the trapped gas from the pouch is not sufficient to resolve the problem. More gas will keep building up and the same problem will develop again and again. I think you’re on the right track now, however, Jeff — the next step in such cases is to treat with Diamox and/or perform a thorough pouch flush in order to prevent additional problems with positive buoyancy. Hopefully this regimen of Diamox will do the trick and your Sunburst stallion will soon be good as new again. (As with most of afflictions, the sooner appropriate treatment is begun, the better the prognosis and outcome is bound to be…)
Be sure to look over the various causes and preventative measures hobbyists can use to minimize future problems with GBD when their seahorse tank has had an outbreak of gas bubble disease, and, with any luck at all, you can avoid future problems of this kind.
Best wishes with all your fishes, Jeff!