There may be a possibility of aggression, especially if you already have other large sized fishes such as tangs or other surgeonfishes/rabbitfishes (like what aquareef posted).
The minimum recommended tank size for one large angel is around +/-125 gallon (as per RC and liveaquaria). But of course, nasa iyo pa rin yun, at depende na rin sa rock arrangement nga tank mo and the number of inhabitants in your existing tank.
Bioload lang ang kalaban mo.
Adult Lamarck, Xanthurus, Bluespotted, Bellus, Watanabei and Spotbreast Angels are less than 10" in size.