The leaves of my P. caperata are pretty small, but it would be good for a ground cover to hide under. P. sandersii leaves are larger, I haven't put one in a tank with a frog yet to see how they hold up. They seem more delicately attached for their heavy size. I haven't actually paid close attention to how the leaves form on these.
There are some that look like P. obtusifolia but collapse and sprawl around earlier, I think I've seen these labeled as P. magnifolia, but don't know how accurate that is.
There's also P. clusiifolia which has thick elongated leaves, usually coloured like your variegated one but with red edges. I've seen these described as growing more upright and taller than P. obtusifolia, but mine seems to be growing so slow that getting too tall would be less of a concern.
When your P. obtusifolia get too tall, you can chop it off just above where a leaf branches out and stick this top part straight in the ground. You'd have a short little forest in no time this way, but would take monthly or bi-monthly pruning depending on how aggressively you prune and how tall your tank is.
A Maranta, or prayer plant, might be another nice option for a large leaved low growing plant for you. The leaves are paper thin, but it has a low sprawling growth pattern. The 'fishbone' variety, M. leuconeura massangeana, is very colourful and widely available. It will grow vertically if it has a branch or something to drape on, and the leaves can even overlap and support one another to span a space. These also bloom, but little tiny flowers spread out on a generously sized bloom stalk. You have to be looking to find them but they're a nice surprise. If I ever get enough blooms at one time I'm going to make the worlds tiniest bouquet.





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