What about some Tritorus (latin name, I don't know the english one, and in spanish they're "Triton" (plural: tritones))
I had some Triturus alpestris and some Triturus vulgaris, and they're way cool! They usually move slowly, but when they see food, they move really fast to catch it. (if you have some, as anfibians (is that the right word in english?) they love to have a place to go outside the water from time to time, but they always keep their skin wet.
What do you think?
Triturus alpestris
Triturus cristatus
Triturus italicus
Triturus vulgaris
Triturus vulgaris meridionalis
Edited: and they can also regenerate lost members, BTW
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