I used sugar sand, running 1200 gph through my sump and three 300 gph powerheads, I get some erosion patterns but they look natural and I like it, nothing becomes water-bourne (sp). All the finest particles were removed when rinsing or in the next week with a sponge in my sump.
Rinse rinse rinse.
Mike
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This all started with a ten gallon and two clowns.
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