Hi, I have tried (my first attempt at it) to create a paludarium to keep my betta in. I was hoping someone could help me with substrate. The tank is a twenty tall. I created a false bottom component that coves roughly eighty percent of the tank and I will leave the other twenty percent as a "pond" area for the betta. I plan on putting Terra Lite ontop of the false bottom for more drainage, but I do not know what to use for a substrate for the plants. I have done some research online and came across some really good stuff. I just am not sure what would be safe for the fish side of things. Thank you for the help.