Mantis not eating?

So I've had my little N. wennerae since September, and I've only ever seen him eat one blue-legged hermit crab. He rarely takes the Formula One or frozen brine shrimp I give him, yet he's molted twice now and is definitely growing. He's only in a 2.5 gallon with 3 lbs of lr and a 1.5" sandbed, so I have no idea where he's getting all of this food I never see him eat. His only tankmates are 1 stomatella, 1 nassarius, and 4 blue-legged hermits. I honestly don't think it's possible for him to survive on the small amphipod population in my tank, so I'm lost as to his diet. Any ideas?
 
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