If you don't quarantine new fish, you are actually putting them through more stress, I believe. Besides the disease prevention, while in the QT new fish have a chance to be acclimatized to your DT water (prior to the final transfer) and new foods. They then have a chance to become healthy and strong before going into your DT.
Otherwise, if thrown into the DT immediately, they may have to face hostile existing tank inhabitants (like my yellow tang) while in a weakened state, and not used to eating the new foods. If that isn't stress for a fish (and the aquarist watching all this), I don't know what is.
Moving existing stock from an infected DT to a QT is a whole different story, though. My problem would be just in trying to catch them. So yes, I would first try to feed them well and hope their health and immune system carry them through.
But the real solution, which I keep preaching, is prevention, by QT'ing new fish. That is the best for new fish, and for protecting your DT. And it is so easy, which is why I don't readily accept lame excuses for not doing it. I have a 30g QT running all the time, with a canister filter, and water changes are done using DT waste water (from changes), so it costs me next to nothing to keep running and available when I need it. And I use it a lot, actually, sometimes for new shrimp and corals, too (no hypo for them, of course). It is a lot more work to maintain a refugium, actually, as I have done that, too.
Not QTing new fish is like playing Russian roulette with their lives. 5 out of 6 times (reality is more like 50/50 though), they might get away with it. But when they don't, the fish have to suffer (and be stressed) with ich. I just don't think that is very responsible, IMO.
|