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The best materials to use are clay cravel (e.g. Seachem Fluorite) or topsoil pellet (e.g. ADA Amazonia) aquarium plant substrates.

If you fill the planter with regular topsoil it will wash out into the tank water and make a mess.
 

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I did 1/2 LECA, 1/2 eco-complete (or other gravel) on top. As far as I'm aware, it's fine as long as it doesn't suffocate the roots. It just needs to allow the plant to anchor and not be so dense as to prevent water and nutrients from exchanging.
 
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