I'm not saying to euthanize right off the bat either...but because there's no access to a lfs, there's not any treatment options other than putting the Danios back in the DT and simply raising the temperature of the tank. If we just leave them in a bucket, the ich and fin rot will keep getting worse without the possibility of meds or salt for a week. if put back in the tank, the ich will absolutely spread if it hasn't already only compounding the problem (IMO). Believe me, the reason I spend so much time on the site is because I feel like I can help fish from suffering simply by spending time here. But I think this is one of those "for the greater good" situations. If they were my fish, I'd leave them in the bucket with an air stone, monitor them and the fish in the DT very closely, and only euthanize if the Danio is absolutely beyond help and suffering. And of course...try to sneak to the LFS for meds and or salt during a lunch break.