coral catshark

I love my three, right now they live in my refugium and have a six inch sand bed. When they get big enough they will move into the fowlr display tank.
 
k well during the day my male coral catshark underbelly gets like brownish red spots under its under belly , but at night theres no sight of them , hes active and has a nice coloration to him, is it a sign of stress during the day that hes doing that?
 
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