DP>      Yeah, I'm wondering if my gravel isn't deep 
 DP> enough.  I'm setting up a second 20 gallon tank for 
 DP> guppies, and I plan to have lots of plants in it and 
 DP> want to do it right from the start.  I'm wondering 
 DP> about different gravel or what I can put on the 
 DP> bottom.  I've heard that sand is alright to use.  I 
 DP> suppose sand wouldn't be good with an undergravel 
 DP> filter, but otherwise, is it recommended?
I've never tried sand, so I don't really know.  One thing I will tell you is 
to stay away from the little bags of colorful plastic pieces or the big 
crystal-like stones.  they are very light and tend to clog your pump when 
you're changing the water.
Robby
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