For one tree frog in a fish tank that is about 20"W x 12"H x 10" deep, what substrate do you recommend? I read the faq and saw the recommendation for topsoil. But on the forum I see various other options discussed. Gravel base, coconut fibre, moss sheets, etc. Some are described with acronyms that I do not recognize, such as LECA.

I would like it to be simple and low maintenance. Suggestions?

Harry