Go for as much as you can afford without overfilling the tank of course. About 60-80 lbs depends on how light the rocks are. That would also give you a better idea on how the rocks will go together rather than buying one at a time and ending up with a few leftover that somehow don't fit, you can always cement or glue them together but still that would be a lot of cutting and drilling just to get them to stay where you want.
Last edited by Bloodasp; 04-06-2010 at 04:22 AM.
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