Title. I'm curious as to what the most efficient way to increase oxygenation and water circulation in a 20g long Iwagumi-style setup. I'm leaning away from a powerhead simply due to the bulkiness of it....but I want something that can also give more flow around the tank without taking away from the simplicity of the tank. I've currently got an HC carpet with rocks in the middle, an eheim 2215, dosing EI method (50% weekly wc included) and injecting CO2 (paintball w/ adapter and regulator) via a glass/ceramic diffuser. Also, I want to know how to increase oxygenation in the tank without creating too much splashing noise (i.e. raising lily pipes up) or clutter. A carpet of HC is the only flora I have in the tank so I don't really have any stems to hide stuff. Any and all ideas are welcome as long as they're not overly expensive. I approve of DIY projects so go wild. Thanks!