Manu, i answered that question along time ago in that other psot...
Anyway, they will all get along. But, leave out the eel. They just get too big, too fast. They should grow about 1-2 inches per year if you feed them a lot, if you feed them little, maybe 1 inch, a little less. Anyway, look in your other post too see my answer. Hope i helped!
From,
Your friendly neighorhood handyman...