|| "Cris" wrote in message
|| It reflected great deal of light back up to the plants. Yes,
||| there are drawbacks to this substrate (ie. possible anaerobic areas
||| and some fish don't color up as nicely).
|||
|| Could you please explain what you mean about the drawbacks. Thanks.

The drawbacks to sand as a substrate, is that it can compact and develop
areas of anaerobic activity, gasses, that will form to make a pocket of
toxic bubbles... gravel doesn't do this as much, because it's able to be
vacuumed, sand is tougher to vacuum.

Not sure about the coloring up part...

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