"Green goo" is mantis blood. He may be sick or injured. Don't put any feeders with him that could harm him (like crickets) right now... at least until he seems to get better (look and act more normal). There is a good possibility he could die from whatever has caused him to bleed though. Not much else you can do but wait and see how he gets on. Best of luck to you and him.Why is there green goo on my mantis.He just molted to adult last night.Also not very fat
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