The new clown would only need a day or two to become established. Dont want him to much so, as then he may be the territorial one, which could be the case anyways. Sometimes, unless introduced as a small pair, they are impossible to pair up.
Perhaps you could take the resident one out for a few days and then put the two back together at the same time and see what happens then, as neither is the established fish.
Yes, the coral beauty is just good at defending itself but can become a bully after being in a tank for awile and new fish are introduced, esp. in a smaller tank.
If your upgrading in the future, then the coral beauty could be added to the larger tank, when the yellow tang is. Both are very capable of looking after themselves. Thats the best option for angels, even the smaller ones.
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Doug
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