02-17-2011, 11:26 PM
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You should be fine with just the gravel, you should not plant java fern as planting will cause the roots to rot attach it to drift wood, ornaments or rocks and the roots will eventually attach themselves where you placed the plant. Wisteria does fine floating or planted. If you really want to use a plant substrate I recommend laterite. You could mix it right in with your gravel, just put some in an old sock and rinse it until the water is clear then add it to your tank. Do you have any lighting for these plants?