Very cool. Not sure how many species would realistically be able to transition to greater depth but it's fascinating that so many of them are already present and that so many unknown species are cropping up...
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I go back and forth on that. Some fish are pretty tolerant of depth change (to a degree) and move up and down in the water column looking for food. But yeah, if they are adapted to the shallow reef waters, that could be a challenge, especially at the rate reefs are disappearing.