My gym has a display tank which has 5x goldfish of average size and 1 bn (so heated) in about 80 litres of water. The other day one of the goldfish was doing the sideways flop thing and a couple of instructors were standing around looking at it - I walked past and said it may be a problem with its swim bladder and the way to fix it could be to feed them peas and do a water change. "Peas??!" they said - "yep" I said. "Are you having us on?", "nope, google it" - then I went off to my class. I came back and one of the instructors spoke to the manager and said how I mentioned peas and she thought that was complete rubbish too. They were told by the guy who maintains the tank not to feed them the pellets anymore (probably cos the fish won't eat them, mine don't) and to feed them flake only - they showed it to me, a brand I've never heard of. Anyway, the next day I brought some peas in and showed the receptionist how to prepare them and feed them to the fish - the fish practically attacked the peas so I asked how often they're fed, and was told 3x a week. They keep a roster but it's not always ticked off so no idea if they get fed regularly or not....
I also suggested a water change - they were very reluctant to do as the guy who maintains the tank does that. So I asked how often and they said once a month.... so the next day I brought my gravel cleaner, borrowed a bucket and changed a 1/3 of the tank and fed the fish more peas. Through the night though, the poor sick goldfish had been attacked by the BN so his tail was completely shredded. I said they'd have to move him or the BN out but of course there's no where else to put either so I suggested taking him home to nurse him back to health - I said if not, he will definitely die if the BN keeps having a go, at least with me he'll have a chance. The receptionist said she'd talk to the manager who'd be in later that day, I gave my number and said call me if you want me to get the fish tonight, if I don't hear - I'll know they don't want me to take him. I didn't hear so assume the poor fish will be dead by the time I next visit the gym on Tuesday
Anyway, that's my story of trying to be a good fishy samaritan.