I have both red and green ones. When I first got them the green were out all the time. Now I hardly ever see then during the day. It seemed to start after I got some fish but I don't know if they are related. It was weird because I have Peppermint shrimp too and they used to be the night owls now they are out during the day and the crabs pull the night shift.
The red ones are out all the time.