Our premium Springtail culture is great for use as a cleanup crew for your terrarium/vivarium. We ship them in a proprietary Springtail substrate culture. When they arrive, we recommend immediately feeding them. If you want to use them, you can just dump the entire culture right into your vivarium. Mix the substrate we send you into your terrarium's substrate, and your Springtail population will soon be booming! If you want to keep them and culture them more, we recommend adding EZB Mix (available on Amazon) into a 5qt Sterilite bin. Then dump both your cultures into there. We offer a Worry Free Live Arrival Guarantee. If your culture arrives dead, simply take photos, and send them to us. We will take care of you!