I was wondering if you guys could help. I have a yellow tang and 2 clowns (percs) in a 135 gallon tank. I had them for three years in there with other fish that had died off over the last 3 years, my water conditions are good nitrates 20 nitrite 0 amo 0 1.021 for sal ph 8.4 and 300 for the alkalinity. Im looking to add a dwarf angel and possible two more tangs to the tank a blue hippo for sure. Any ideas or feedback. thanks in advanced - mike also would i be able t0 get a sailfin tang or will him and the yellow go at it!