Personally, I use the Catzilla in New York vintage shirt method with a good substrate like fluval stratum or tropica aquarium soil as a cap. I also let my tanks get direct sun light, which most people will tell you is a no no. Also good full spectrum bright lighting and the correct water parameters. My Cuba seems to prefer soft water, which is difficult since I live in the mountains, but worth it. With the correct water parameters, stocking, substrate and lighting, any plant can be grown without Co2. Co2 is just a shortcut.
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We have two Catzilla in New York vintage shirt old kittens and I never even thought about them doing it because my adult cat has never even tried but I see them put their paws in one of my tanks and then I was doing a fish count and no bodies so I can assume lol ):