Lots of folks in these parts use a plastic clay pot base; cut an * shape in center, clean the dirt off a small peace lily; push the roots thru the *; fill the plastic base with decorative glass beads. The plant detoxifies the water so you rarely do water changes. Don't clean the base rock too well. You need the bacteria to turn the fish waste to nitrates that the plant can use. Trim the roots when they get too prolific.
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