reefraf

i am looking to add some fish. Since i have had prior problems with semi-aggressive fish, i typically stick to only peaceful fish. I am definately getting a heptus tang (spelling) and would also love to add a yellow tang at the same time. the yellow tang does say semi-aggressive especially toward other tangs.

I see these two together in alot of tanks. Does anyone have experience with both or how aggressive a yellow tang really is.
I really dont want to put him in my tank ...

What is the perfect Alk level for a reef tank with all SPS corals?

Thanks

I have a 93 gallon marineland cube tank that has been running for about 14 months. it is lit by 2 of the new aquaillumination LED lights. I have a small bioload of 6 fish. Starting back in January of 2010 i began slowly adding SPS corals.

My nitrate, phosphate, amonia are all undetectable on salifert tests. my mg is 1300, alk is a little high at 10, and calcium is 430. I have a Staghorn Acropora and the DFS blue tenius.

At first, my lights were definately too hi ...