Look, all I did was search “Swim Bladder” in the search bar, and out in @Colin_T’s name. The results were all conclusive:
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“Swim bladder, and there is no cure” “there is no treatment for swim bladder problems”
That's the problem with just doing a search and not truly understanding what he's saying, or when and why he suggests certain treatments. If it was as easy as doing a search and picking out the highlights, we'd all be experts at diseases.
Have you also read him saying that real swim bladder disease is extremely rare? There are a whole bundle of conditions that can cause a fish to swim oddly, that usually get labelled as "swim bladder", and have different causes and treatments. Read this answer he gives a little further down in the search results, when you actually click through and read what he wrote:
"The fish either has air trapped in its digestive tract, or has a swim bladder problem.
Stop feeding dry food for a few days and use frozen (but defrosted) instead. If the fish still floats after being fed frozen foods for a week, it has a swim bladder problem. If the fish swims normally after the frozen food, it is air and you will need to reduce the dry food in its diet, or wet the dry food before feeding."
Same advice he gave me when I posted about my gravid guppy, who is alive and well and swimming normally right now BTW.
And
third search result down, without even having to click through:
"No. Fish don't get constipated. It's a mammal/ human problem caused by lack of fibre and lack of water.
Swim bladder problems are rare in fish and most of the fish that allagedly have
swim bladder problems actually have air in their intestines and are fine after they fart it out. Dropsy is... "
You have no idea whether this play referred to is suffering from ammonia poisoning, trapped air, some bacterial infection, or has "swim bladder disease". You just assumed it was, looked for highlights from Colin's advice without understanding it, and told OP to euthanise and that there is no cure. You don't even know what he's trying to cure, since we don't know what is making the fish swim this way.
Same as the other day when you and others were telling someone to use Colin's salt water treatment, in a newly cycled tank that had only had fish in it for two days. Without even knowing the water test results yet. And admitted that you didn't even know why salt is used. After some more questioning, it turned out the ammonia levels were at 2ppm. The fish were suffering from the water quality/ammonia burns, and salt would have made things far worse, not better. Colin doesn't recommend salt treatment willy nilly, it has a purpose and it's not always suitable.