Thanks everyone. Day 2 with these little guys. While the larger, I presume female, one appears to be just ignoring through (and at times spitting it out) it is the smaller one that I'm worried about. He does not even appear to notice any food that falls around him, and swims much closer to the sand to bed. His swimming also seems more laborious than the other's.
I hope I'm just being over concerned rather than having any real basis to worry.
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