Heathd;4846984; said:
Yep Purples and Sohals are the most aggressive. With that being said, a lot of times in big tanks like the one you have now and definitely the possible new one you could keep one of them with another tang or two. The key being to put in a larger different tang first and then put in the more aggressive one with it being smaller.
Really look at the different family(?) names like Naso, Zebrasoma, Acanthurus, Ctenochaetus, and Paracanthurus(hippo). Don't put more than one of each of these families(unless you put in multiple yellows or convicts).
So with the tank you have now, you have a Naso(they generally aren't very aggressive unless they have become too accustom to being the only big fish in the tank, then occasionally they won't allow newcomers. This possibility would not occur if you moved the fish into the bigger tank cause it would have new surroundings.) You could definitely add a yellow tang or 3 no problem to your setup. A hippo tang would also work.
The same deal would apply to keeping angels, just even more care would need to be taken when putting them together. Staying away from the really aggressive ones(like Passer, Queen, or any other Holacanthus species.) if you wanted to keep more than one. Realistically getting one angel for this setup would be best(I am breaking this advice currently however with an Emperor and Scribbled in my 210). I would actually recommend you getting 1 angel for a setup this size. They really are amazing fish, lots of personality.
So with either setup really you could do(for example):
1 Emperor Angel
1 Naso Tang
1 Hippo Tang
1 Yellow Tang
1 Trigger
A bunch of small "community" fish
If you go with the larger tank you could add a few fish to this list above like:
1 Harlequin Tusk or other wrasse
1 Butterflyfish
A few more community fish
The examples are just to give you an idea of the amount of stocking you could safely do and some possible species to look at. You obviously will pick out what you like.
