I took a planter that I lined with a piece of PVC pond liner because the planter has a drain hole. I laid over the liner a sheet of geotextile. I cut a piece off the front portion of the planter. The water will drain back in the tank slowly flowing against the geotextile that I cut longer. Eventually, some moss could be established there.
Some of the plants: Pothos, Spathiphyllum (very small for now), Tradescantia zebrina, Papyrus (Egyptian?), Fittonia.
So this is what the planter looks like on the tank. Now I just need to figure out how I want to setup the pump.