I would think a small air lift sponge would be just fine. It’ll do the water movement, break surface tension, and help contain particulates, all while being the easiest filter to maintain ever.
Keep an eye on your betta’s behavior to know if the output is too much or pointed where it shouldn’t, or if the location should change.
Share pics of your work in progress, please. I love new tank setups, to see what someone creates.
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I can only grow plants when they're completely under water. Everything else is doomed.