I am going to be setting up a 135 gallon tank(72"l,18"h,24"w),I want to keep tang(s).First off can I keep tangs of the same genus or will they fight to death.I would like to keep three tangs in this tank sice I have read that two tangs will constantly fight together.I was thinking about keeping a yellow tang,a purple tang,and a sailfin or hippo tang together.Before anyone tells me I should buy a bigger tank,I am going to be a collge students and do not have money fora 300g,500g,or 1000g tank.I have enough money for thisn135 and I ahve enough room for it.It isn't just the money I would not have room for a 300 or larger beacuse that is 8 feet long.So any suggestions comments are appreciated.I will go with everyone's advice.Even if you guys say only keep one tang,can you tell me what the best one is to own.By the way,in the future a few years I will be buyinga large tank(300 gallons or more) and therefore thats where the tang will go if he gets to big or needs more swimming room.My lfs also has a 300g display tank and takes back large tangs and puts them in there until someone who has a large tank above three hudred gallons is interseted in buying these tangs.A few months ago,he had a 9 in yellow tang in the 300g tank.