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I had this idea for him, that when I get my own place I would build a pond underneath a decking with a hatchs I could open to feed him, made of glass so I could look into it. With light fittings for a heat lamp above an island in the centre of the pond for him to bask. Also a pump and heaters since it's Ireland.

I got a paddling pool last summer to give him a bigger place to swim while I was doing stuff outside. But, I looked up after a while and there were two sea-gulls circling above it so I decided the pool was maybe a bad idea.

Hopefully you can figure something out for him.