I have had my peacock for a few weeks now. He has a 30 gallon with about 10 pounds of live rock and about 2.5 inch sand bed. I have a few snails and a few smaller crabs in there. He loves mysis shrimp and crawdads, but the other day I was experimenting and dropped a feeder fish(goldfish) in. He attacked it immediately and grubbed down. Is this a bad food for a mantis? I try to keep his diet normal but figured a chnage every once in awhile wouldnt hurt. Please tell me if Im sinning!!!