I have a goldie in a 20L by himself right now trying to cure him of the same swimming ailment. He just lays on the bottom on his side swimming around occasionally. This seems like a neat idea to help the fish out but the underlying problem isn't being taken care of.
This video made the rounds on the goldfish forum....it's a joke. Unfortunately the goldfish would develop sores where the devise is touching it. My goldfish developed swim bladder and used to wedge himself behind a decoration to stay put. Within a day he had developed sores.
To the folks who mentioned tank size, thank you. One goldfish needs 20 gallons. each additional goldfish is 10 gallons....but some forums recommend 20 gallons. I can vouch for 4 goldfish in a 50 gallon is over stocked. I'm WC every 3 days. My goldfish gang is nick named the turds for a reason. My 1 inch goldfish is now 4 inches...all in 10 months. That cute goldfish grows really fast.
Though I'm not sure all goldfish experts would agree, long term exposure to high nitrates can irritate the swim bladder and cause floaty issues.
The article doesn't actually state what size their tank is, and I think it's possible they moved all the fish temporarily to a smaller tank solely for a photoshoot. I think they would want all the fish in one shot and fairly easy to see for the article. It's also possible this guy has no idea how to care for goldfish. But I don't think it's likely someone who spends 3 hours making his fish a life-jacket, isn't going to do a little research about their requirements. Maybe I'm just an optimist
This is cool, but like said, the tank is wayyyy to small. Plus goldfish can grow much larger, he will really need to check him like daily and adjust the body sling as needed, but he might become stunted due to the tank size....I wonder what food he feeds them too...food can really have an impact of goldfish and there floaty issues.
Golfish can get stunted from ANY tank size. In the wild, they can grow as big as carp--several feet.
My Golden Rule of planted tanks: WWTAD-
"What would Takashi Amano do?"