Hello folks! New member here Picked up a couple of these little fellas, they are slightly over the size of a toonie. Was hoping to get a rough estimate on their age, being as how I can't find anything to reference on the web. Also, they are currently housed in a 50gal aquarium on paper towel for observational purposes. At what point would it be safe to switch them over to something else, such as sand? I would post a photo but as a new member, my actions are limited here on this forum. Any information would be greatly appreciated, thanks for your time.