<a href=showthread.php?s=&postid=13287349#post13287349 target=_blank>Originally posted</a> by Mikigo
300 gallon is a large tank. i have seen powder brown, blue, achilles, yellow and purple tangs in some large tanks without any issue. i suspect you would be ok.
i do have 3 yellow, 2 purple, chevron, 2 sailfin, hippo and powder blue in my 700g without problem.