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Most people with planted tanks do not clean the gravel or only do it very rarely. If the mulm accumulates on top of the gravel, they usually sipnon it out while doing a water change. Mostly the mulm works down in the gravel and helps fertilize the plants.

In a tank without gravel, all the mulm will be visible. If that doesn't bother you, no problem. There are even a number of plants that can be grown floating, such as Ceratophyllum, various mosses, various floaters like duckweed and Ceratopteris, Other plants can be attached to driftwood, for example, Microsorum and Anubias.
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