Thoughts on clown tang in 180?

[Zoaelite]

In my 170g I have 6 tangs;
1 Purple Tang
1 Yellow Tang
1 2 Spot Bristletooth Tang
1 Chocolate Mimic Tang
1 Lemon Peel Mimic Tang
1 Orange socket Tang (Acan auranticavus)

They all get along very well, I think a big key to that is having an automatic feeder and a VERY large amount of live rock. I added them in the following order:

1. Orange Socket
2. Yellow Tang
2. 2 Spot Bristle
2. Chocolate Mimic
3.Yellow Mimic
4. Purple (The biggest)

I won't be adding any more until I upgrade my tank size. As stated I would stay away from the Clown, powder blue, and possibly the naso. How full is the 180 as far as liverock and coral goes?
Levi