How many tangs can I keep

I have three tangs living in a 150 cube. They have lived together for seven years without a single issue. Just curious if this could cause issues down the road or if the tank is big enough? I have a 120 without any tangs in it that I could relocate one of them to. Like I said I have had them for seven years and would hate to loose one of them(blue tang,purple tang,and chocolate tang). Thanks for any advice.

I wouldn't move them unless they start to look stressed. but at seven years I doubt that to happen... what other fish are with them ? are you having the same sucsess with them ? I lost a chocolate when i upgraded and will some day replace. right now I have a yellow, black, and chevron . do you have a picture? would love to see it.
 
There is a marine beta,two clowns,starry blenney, and a pink spot goby. Not the best in the world a computers but will try to upload pics.
 
Thank you I like the lemon peel as an adult and jug so mimic it is thanks guys

Good choice, better than any zebrasoma tang. The lemonpeel mimic is the best looking juvie of the four mimic color varieties.
 
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