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i got some plants from my local guy that he grows on a mat that is poly cloth the filter kind.. they work out great and you can cut them to size and shape
I moved all my plants from gravel to sand and have added some more. I can tell you, it seems like once they was in the sand they just took off. Just remember you need something under the sand for them. I just used left over root tabs from the gravel.
They stay in the ground better also, no more of my snails or Bumblebee cats uprooting them lol
I don't know of any plant that can't grow in sand. I have numerous tanks that are only sand with dozens of different plant species. All I have is sand and nothing else under it. Most plants can get all their nutrients from the water column.