So I'm pretty sure I know the answer to this, since Zebrasoma tangs aren't usually friendly to conspecifics, but I have the opportunity to get a purple tang for a screaming deal. The problem is I already have a large yellow tang. The yellow is about 5 inches and the purple that I would be adding is 2.5-3". I'd happily sell the yellow to get the purple (that's the fish I got into the hobby for really). Is there anything that I can do to have both, or is it a safer bet to just sell the yellow?