Am I overstocked

[Gools]

Just want some opinions, to see if people think I'm getting overstocked. Currently, I have in my 180g mostly sps: 1 mimic tang, 1 small 2" Yellow tang, 1 Large Copperband, 1 perc, 1 blue damsel, and about 10 green chromis. I want to add one more big fish like a purple tang, and a couple of small fish like gobies. Any opinions. Tank is well matured, and my skimmer will have no problem keeping up with a larger load. Also all fish get along great with each other. So Far!