no a thing.
I just know at least a couple of those fish would love a bigger system.
I had a yellow tang in my 72 (got him in a tank tear down I bought) and I sold him to someone with a bigger system as he was obviously stressed in my little tank.
Not to say they were/are unhappy in yours, but it's a no brainer that the tang and dragon goby in particular will be happy to have some more room.
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