When I first got my 150 a year ago I had one it got Ich like stated above. I actually lost 2 tangs (Achilles and a Alantic) till I got the UV and now I don't have any ich problems anymore it was like a miracle! I also had a blue (regal) at the same time that manage to hold on till I got the UV set up and hes still with me a year later. I sucessully have 4 tangs now and have had them all for alomst a year.....Hippo, Powder Blue, Atlantic, and Yellow, they all tend to play nice the hippo and the Powder like to play I'm in charge occassionally other wise they almost never get in fueds! Its a bit overstocked looking back on the decisions but they look so darn happy with each other!