Well after the initial advice no responses. But I still appreciate the original responses. Tonight our Hippo Tang succumbed to the Brooklynella and died. My Daughter cried - hate to see that. I think we would have had a fighting chance, but the QT tank was right at the worst part of the cyclying process when I had no choice but to add the Hippo. High Ammonia, and High Nitrites. I did a 40-50% water change which helped lower the nitrites, and the yellow tang and clown are looking better. Unfortunately we still have one fish left in the DT - a royal gramma. I can't catch him no matter what I try. Took all the live rock out and inspected each piece carefully, but he is an amazing hider. Also, I am torn between leaving him alone in the DT where his Brooklynella will get worse, and dumping him into the DT which is at a bad place in the cycle - thus stressing him even worse. Its a tough situation. One fish and everything in our tank is at risk. Hoping for the best tomorrow and that the amonia levels at least will be down to zero so I can move the Royal Gramma in there.