junbug1970,
I won't comment on the tangs but you shouldn't be feeding them Broccoli. Broccoli is not part of the tangs natural diet and should not be fed to the tangs. Broccoli is not easy for the tangs to digest, neither is lettuce or any other "peopl food." I would recommend feeding your tangs Nori (Unsalted, Unroasted). You could find it at your grocery store. Tangs love it!
Anyway,
Here's an older shot of my tank. 150lbs of liverock.
Graham