great. another layman mantis name. unfortunately bumble mantis doesn't refer to anything. If you post a pic it might help us ID it. The RC link provided to the mantis forum (where you can post a pic) will be better though.
as for food, it really depends on size of the mants. Feed too much and it will bury the food and it may screw with water quality. Most mantis keepers feed once every 2-3 days.
You should feed a variety of frozens too. silversides are fine, but try clam, scallop, krill, etc etc... they are't picky. Pick 3 different frozens and cycle between them. If the mantis is a smasher, live hard shelled foods will also be necessary.
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