Hmmm, IMO, there shouldn't be that many tangs in the average 5ft tank.
Just because Wei Leong has squeezed in that many tangs into one tank doesn't mean that if he can do it, everyone else can.
I believe he is going to let go of some because of aggression issues.
I don't think you'll like to see all your money disappear because of ick outbreak due to stress amongst your tangs right?
Remember that your marine tank is supposed to be an oasis for your fishes.... not a torture chamber.