Here are some tricks I've learned over the years, often from people who own or work in aquarium stores. I take the view that prevention is more important than knowing how to cure a sick fish.
But prevention is very inconvenient for many, so this is just thrown out there as possible best practices.
Find out when new fish are delivered. Most stores will tell you. Check the next day. If no tanks are quarantined, be skeptical. The good local stores would have a QT of at least 24 hours (not enough, but better than nothing) up to a week. The local chains sell the moment the fish tumble out of the bag, and that's the serious buyer beware zone.
Go as soon as they open. If the tank bottoms are littered with corpses.... many stores pay someone to come in early and remove the 'deads', but if they can't even be bothered to do that, run away.
Look at every fish in the tank. If it's a central system, look in all the connected tanks. Do you see any unhealthy fish? Any Ich? Never buy from a tank with any sign of disease, even in the species you aren't shopping for.
If you can, don't buy on the first visit. Give it a few days and do a second visit. That has saved me a few times, as fish that looked good had blossomed into awful diseases.
Never rescue fish you feel sorry for without preparing in advance. That sickly sad Betta could easily have fish tuberculosis, and should never be mixed with other fish. If you are into rescues (bad fish stores that mistreat fish will love your business) quarantine should be forever.
Look up common fish diseases and learn to recognize them. Choose your fish. No one chooses for you, and watch the catching process closely. Never buy an unfamiliar fish without pulling out your phone and googling it. It may be a youngster of a big nasty bruiser or a fish with needs you can't meet.
We're all supposed to quarantine, and maybe 1% of us actually do. So use your skills and try to avoid trouble.
But prevention is very inconvenient for many, so this is just thrown out there as possible best practices.
Find out when new fish are delivered. Most stores will tell you. Check the next day. If no tanks are quarantined, be skeptical. The good local stores would have a QT of at least 24 hours (not enough, but better than nothing) up to a week. The local chains sell the moment the fish tumble out of the bag, and that's the serious buyer beware zone.
Go as soon as they open. If the tank bottoms are littered with corpses.... many stores pay someone to come in early and remove the 'deads', but if they can't even be bothered to do that, run away.
Look at every fish in the tank. If it's a central system, look in all the connected tanks. Do you see any unhealthy fish? Any Ich? Never buy from a tank with any sign of disease, even in the species you aren't shopping for.
If you can, don't buy on the first visit. Give it a few days and do a second visit. That has saved me a few times, as fish that looked good had blossomed into awful diseases.
Never rescue fish you feel sorry for without preparing in advance. That sickly sad Betta could easily have fish tuberculosis, and should never be mixed with other fish. If you are into rescues (bad fish stores that mistreat fish will love your business) quarantine should be forever.
Look up common fish diseases and learn to recognize them. Choose your fish. No one chooses for you, and watch the catching process closely. Never buy an unfamiliar fish without pulling out your phone and googling it. It may be a youngster of a big nasty bruiser or a fish with needs you can't meet.
We're all supposed to quarantine, and maybe 1% of us actually do. So use your skills and try to avoid trouble.