All I can tell you is to plan it out extremely well. I also keep and breed dart frogs and I’ve seen a lot of water features end up being torn out after a few weeks. The biggest problem is people building things and then realizing they didn’t think of everything, or it was too hard to keep clean or any number of things that can end up going wrong. You definitely need filtration, both physical and biological, and probably way more than you think with your animal doing it’s business in the water. You also need to figure out if the tegu will rip everything out and flood the room.
I’m not trying to discourage you. Water features can be amazing. I’ve seen really good and laughably bad. Planning seams to be the biggest thing.
If you are building a big pond you may be able to get a kiddie pool and decorate around it, something like that. You can find pre formed plastic turtle ponds and do the same thing. that’s the route I think I would go with.
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