I'm thinking of making a walstad tank, but I've never had a tank that I didn't need a filter before. It would be either a 2.5 gallon or 5 gallon. I'll move my betta to it as well (and maybe get some ghost shrimp), since I want to use that tank for pea puffers (there's a lot of snails). Are there any recommendations for substrate or soil? Are there any lighting requirements, or does it just depend on the plants? I'm terrible at aquascaping but I'm willing to give it another shot.