I totally agree with the above, both are too larger for a 75g. In fact, the yellow is questionable as well. I personally wouldnt put a tang in anything less than a 125g tank. The only exceptions are the bristletooth tangs, those I would put in a 75g wihtout a doubt.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.