Niles do like water,look at that tail. But they are not a fish, look at those legs/claws. They burrow/dig also. Savs love to do burrow/dig, that is what they do for many reasons. I would worry about getting all the sav it needs before buying a nile. 6x3 or 8x3 trough for the sav. 8ft round trough for the nile.

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