Both are very easy corals to care for.
Just a word of caution with the bubble, they get big, VERY big, so eventually the 12G will become to small for it. Mine opens up to about three times it's size during the heart of the day. Their tentacles also give off a stronger sting than some other corals so make sure you wear gloves when handling it and leave room between it and other corals. They also like to be fed once a week, I shoot some fish food during feeding time at it and that's fine.