We kept our milkfrogs on newspaper for convenience and ease of cleaning the enclosure, with the shoddy track record of this species we wanted to maintain as clean of an environment as possible, natural vivs can be a problem to clean as well as keeping track of the inhabitants. We had to continuously sort the milk frogs by size as they grew, this enabled us to feed appropriately sized insects and prevent large gluttons from eating everything.
The milk frogs are cute and enjoyable frogs to watch, plus they are great eaters. IF you want good quality milk frogs contact Thomas at pumilio.com; you won't need to see them to know you will be getting high qualtiy frogs.
Sorry I cannot give any ideas on how to morph them out, the breeder won't disclose his mehtods, sort of trade secret.
thanks
ERic