Since goliath worms/hornworms do not have a whole lot of nutrients, do not make them a staple feeder. You can mix crickets and dubias together for one feeding, or you could alternate. For crickets, when feeding only crickets, I want to say about 8-10, but if they are large then probably 8. For dubias, same amount, but a little bit smaller, probably 6-8 for every feeding.