[Hallyx]

Sounds like a beautiful idea, especially as you have background with plants. Beside a heater, you'll want to have a filter to remove debris and to circulate the heat throughout what will be a shallow tank.

Love to see pics, especially as you're building the paludarium. We can all learn a lot.

Welcome to the forum.

 

[Hallyx]

The sponge on this sponge filter lays down horizontally, making it very easy to hide:
Amazon.com : Elite Single Sponge Filter : Aquarium Filters : Pet Supplies

Lay your heater down horizontally, too