Initially, I was trying to make a paludarium to raise (potentially pickerel) tadpoles in with separate water and soil sections. Despite doing several successful water tests before setting it up, water has been leaking through the vinyl barrier between the soil and the water (note: the rocks are siliconed onto the vinyl and not used as a barrier itself). Finding and fixing the leak would require me to practically dig up the whole tank so I’m thinking about allowing the leak to continue, turning it into sort of a wetland build. Will mold be an issue with a substrate of coco fiber, backyard soil, and sphagnum moss? Are there any other issues I would face with stagnant water in soil?