That may be the problem. Mealworms are a good diet, used with other variety. Try feeding your Schneider on large crickets or locusts if you are able to get hold of them (i'm not sure of their availablity in Canada, but here in the Uk they are frequent) You'll notice a lot more activity when the Schneider has something to hunt, rather than eating mealworms from a bowl. I give mine mealworms and waxworms occasionally, but not too often.
Also, seasonal changes can affect the animal no matter what temperature it is kept at. The outside temperature of the viv will decrease significantly over the next few months, so these seasonal changes will affect him, especially if he is wild caught.
Hope this helps