Type of Substrate For A Planted Terrarium

[KrabzAga]

Hi guys. What type of substrate is the best and cheapest for planting a terrarium? I am trying to plant pothos and might get some other type of plants. I want the substrate to be able to grow both plants and be safe for the salamander in it. I also have a big bag of eco earth and I want to use that to mix with the potential substrate too to not waste it.

 

[Vick101max]

You could try organic potting soil with eco earth.