The rest are a little larger and can probably take the cool temps a little better. When we move next month I will have better control of temps. These guys attatch to your heart because they are so tiny when they are froglets that everyday seems like a touch and go situation and they are very hard to find in a 75g fully planted enclosure. Plus the cost, each one costs over $100.00 so it takes time to save up and obsess over them. I have had mine for over a year now so I think it hurts more for John to sell his imitators that he loved so much to get the new ones and then lose one. It all just sucks to have any frog die.