Nothing wrong with feeding wc bugs. But if you choose to do so I wouldnt feed anything I caught in my yard or a residential setting. Go to a nature preserve or a field out in the country some place near you. Fertilizers and pesticides are a problem in residential areas and you dont want your cham to eat a bug that has come into contact with those. Also do some research and learn what is safe to catch and feed. I feed mainly grasshoppers, katydids, dragonflies, mantis, & moths. If i cant ID it I release it. Thats why i dont mess with butterflies very much. Most moths are safe, some butterflies are toxic.