I have QTed off and on over the last 25 years. My current tank, which is just over a year old, I have not quarantined any of the fish. I have never had any disease outbreaks in any of my tanks, whether I was QTing or not, and have probably lost more fish in QT than I have not QTing (meaning in the first 8 weeks of having a fish, I’ve had more losses in QT than in putting fish directly into an established tank). I think I’m leaning more towards not QTing in the future, when I really analyze my experiences with both methods, the pattern I see is that fish do better in an established tank with real live rock and solid nutrition than they do in an immature QT tank. Obviously, observing fish before buying and buying from trusted sources are very important.
Three or four weeks ago I bought a little Valentini puffer that looked fat and healthy (behavior was observed over a couple days and it was active, no tail curling, was picking at rocks, etc), but it had a little bit of ich. I brought it home and put it my tank, and in a couple days the ich was gone, then a couple days later it had a few more spots, then those went away and since then (about 2 and a half weeks), its been ich free, active, eating, and looks great. None of my other fish have showed any signs of ich. Now, I know that some people will say that putting this fish in my tank was reckless, but I’ve kept quite a few puffers over the years and know that I mild case of ich isn’t a big deal if the fish is otherwise healthy and well conditioned (especially if there’s been s recent stress event, which is this case there was - surviving the entire supply chain). I also knew that my other fish were in peak condition and wouldn’t be affected (because I know that I already have ich in my tank and none of my fish exhibit symptoms). My point is that I think proper observation (so buying fish that are in good condition), a mature tank that is bacterial diverse (real live rock), good nutrition, and avoiding stress can be just as, if not more successful than QTing. That said, I understand why people QT and I usually recommend people who are new to the hobby with immature tanks that don’t have the experience to make judgements about a fish’s health based on observation to QT everything.
There have been a couple comments saying people who don’t QT are dumb and making a bunch of inept comparisons/analogies, it’s this kind of rhetoric that skews the data. People who don’t QT and are successful a lot of times just don’t say anything because they don’t want to be shamed by militant devotees of QTing. I know I have been reluctant in the past to admit that I didn’t QT something because of this kind of rhetoric. I guess my point is either method is fine, and neither has 100% success rates, so do what works for you, and ignore the people who claim that there is only one way to do things and that their way is the only way.
Three or four weeks ago I bought a little Valentini puffer that looked fat and healthy (behavior was observed over a couple days and it was active, no tail curling, was picking at rocks, etc), but it had a little bit of ich. I brought it home and put it my tank, and in a couple days the ich was gone, then a couple days later it had a few more spots, then those went away and since then (about 2 and a half weeks), its been ich free, active, eating, and looks great. None of my other fish have showed any signs of ich. Now, I know that some people will say that putting this fish in my tank was reckless, but I’ve kept quite a few puffers over the years and know that I mild case of ich isn’t a big deal if the fish is otherwise healthy and well conditioned (especially if there’s been s recent stress event, which is this case there was - surviving the entire supply chain). I also knew that my other fish were in peak condition and wouldn’t be affected (because I know that I already have ich in my tank and none of my fish exhibit symptoms). My point is that I think proper observation (so buying fish that are in good condition), a mature tank that is bacterial diverse (real live rock), good nutrition, and avoiding stress can be just as, if not more successful than QTing. That said, I understand why people QT and I usually recommend people who are new to the hobby with immature tanks that don’t have the experience to make judgements about a fish’s health based on observation to QT everything.
There have been a couple comments saying people who don’t QT are dumb and making a bunch of inept comparisons/analogies, it’s this kind of rhetoric that skews the data. People who don’t QT and are successful a lot of times just don’t say anything because they don’t want to be shamed by militant devotees of QTing. I know I have been reluctant in the past to admit that I didn’t QT something because of this kind of rhetoric. I guess my point is either method is fine, and neither has 100% success rates, so do what works for you, and ignore the people who claim that there is only one way to do things and that their way is the only way.