Hmmm, a Yellow tang and two Hippo's in my reef, no probs,,,
heck i get the Hippo's small, and return them to the LFS, to replace and start again,,,
only can offer this on Angels, got a Queen in my 180 FO,,,not too bad, can get mean if provocked, no harm to either party, just a square off
bottom line, tangs and angels,,,, both can be ornery or peaceful
i know that is not what you what to hear
depends of which species/combo,,and a LOT of other things,,, fish size,combinations of same, tank size,,,and overall good luck.
what i'm trying to say is,,,what is said here,in books, knowledgable people,,,,does hold water,but nothing is written in stone on what works,,,get a background on the combo's you want,remember the existing fish in the tank will prob be the dominant one, so think of size /behavior on the second fish,,and hope for the best.
both Tangs and Angels have peaceful or aggressive members,just gotta choose well, and cross your fingers,,,
BTW: never had tangs with ich/black spot in 25 yrs,,,
i think i cursed myself,,
not sure, hope this "helped"
