I finally set up a quarantine tank for when I buy new fish. My questions are how long should the fish stay in quarantine? And after the fish stay in for their alloted time can my existing fish still get ich by the stress of introducing these fish. The fish in question are a yellow tang and a niger trigger. if i understand correctly the niger is pretty tough and is not easily succeptable to ich. if this is the case can he go in earlier. Any suggestions would be helpful.