I woulda had some photos but my phone broke so I wouldn't be able to take better quality photos but here's some from an ipod touch. As I said, it's a basic setup but I've had no problems and I don't have any substrate because they may choke on small pebbles and it's easier to clean up waste and debris.







Here's Mrs Frog







Again, I only noticed her dark patch a few months ago, and I don't think she had it before.