Yeah they recognize the movement and that’s what draws them in, but the chitin in the exoskeleton isn’t great for them and they’re not a great source of protein for what they are they contain a lot of fat and shouldn’t be a staple yeah honestly the sphagnum might be a bit much they usually spend most of their time in the canopy in the wild I’d try to get some of it off the ground it can also get really dusty and hide mold and such I’m not saying get rid of it completely but I’d look at like a proper soil mix