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Re: Onyx gravel or sand

Definitely get the sand, it's grain size is closer to small gravel and
the gravel is huge.  I have 2 tanks with the sand, it's great stuff
and it won't get in your filter or python.  Be aware though,  you will
get an increase in Kh and Gh, it raised my Kh from 6 to 8 and my Gh
from 10 to 13.