River sand is awesome, if you can collect your own, you can get rougher grain sand by being selective of the area you dig it up from.
But even the finer stuff has fairly little dust in. It gives me so much pleasure watching my sandfish forage in the sand from the river they come from. The cory's and pleco's also seem to enjoy it.
So the problem with coral sand is just the PH right?
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Coral "sand" is a natural buffer that keeps pH around 8+. This is what marine environments need. You cannot use it for a planted tank.
Current Tank: 125g reef ready with 40 gallon sump. ATI 4x80 watt T5 with 2x Super Flora T5 Giesemann, 1x ATI Purple Plus, 1x ATI AquaBlue Special. GLA CO2 system, Flourite substrate, Digital Aquatics Controller.