What's the Name of That Book??? discussion

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Crisis on Conshelf Ten
SOLVED: Children's/YA
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SOLVED. science fiction book read in grade 5 about a girl who is coming from a new community in space, and she ends up having to slowly get used to gravity by living in an under water community. [s]
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"When Moon-born, 15-year-old Kepler Masterman visits Earth, friendly relatives welcome him to their experimental community deep under the ocean, where he discovers a sinister situation linked to the mysterious, water-breathing Gillmen. By the author of "Ring-Rise, Ring-Set".
I'm looking for a science fiction book about a girl who is coming from a new community in space, and she ends up having to slowly get used to gravity by living in an under water community. I know something happens and I had always thought it was "Crisis in deep sea 9" or something similar, but I've been looking now for the better part of 20 years to no avail. I read it in grade 5, which was roughly 2005. My teacher said it was a gift from her brother whom I believe was in Ireland if that helps. Also, I believe it's in GM or YA.
Thanks so much in advance, and if it can't be found, at least I'll know I've tried as many options as possible.