I don’t think they breed as fast in clear totes, but they end up looking more healthy, and get bigger (because they know when to take a break) and it’s nice to let them know if it’s day or night. Also if you don’t separate the babies from their mom then they end up growing a bit slower, but the babies taken care of grow up to be bigger, and look way healthier, the ones that I separated looked beat up compared to the ones I kept together, and again it’s nicer for them to be kept together.