What instar are the nymphs you are getting? Looks ok for a larger sized nymph but a small young nymph will be lost in there and may have trouble finding food.
Also if the
Tenodera are very young 1st/2nd instar you may not have much luck with them, they are not the easiest of nymphs due to high mortality during the early instars. They are not ideal starter mantids dispite what some people say due to these reasons, in fact the way they drop dead can put people off mantids forever.
I do like them tho and wish I'd never got rid of my stock