I cannot speak for Aquasoil, but this happens with most any clay gravel, or volcanic rock gravel substrate. It is not unique to Eco Complete. The gravel is lighter at first because it contains oxygen. It gets heavier over time as it absorbs gunk.
The problem is usually temporary if you are a little patient. Once the stems become rooted its no longer an issue. Until then, you can plant the stems deeper, or put some larger pebbles around the stems to hold them down for a couple weeks. If your stems are not taking root, then you have other problems.
Robert Paul Hudson
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