What kind of substrate do you have in your fuge? Keep in mind to keep the Mantis happy you'll need lots of rocks (rubble that it can move around) so it can build caves and it will stir up the substrate. The whole idea behind a refugium is to have an undisturbed area where macro algae, pods, and beneficial bacteria can flourish. This will not be the case when the Mantis is in there. The short answer is yes it can be done, but all you will end up with is an area that is less than ideal for a mantis and a refugium that is not fully serving its purpose.
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