03-30-2011, 01:54 PM
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Lava rocks are ok for some, generally not good for most. However, lavarock is great for plants that need to attach themselves to rocks like java moss or anubias because all the nooks and crannies make for great grips. Plants like java moss will also create a cushion that will make the rock harmless.
If you want to make your own decor, siliconing rocks works. You can also use resin to create ornaments, just be sure it has enough time to dry. How natural it looks is dependent on how artistic and skilled you are with the molding.