Quote:
Originally Posted by allwet
their is probably more under the inital layer of substrate but at least i cant see it.
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Not yet. The larger grains will continue to migrate to the top.
FYI: My fiirst bags of Tahitian Moon (purchased in 2004) were pure black, with practically no lighter colored grains, giving teh substrate a velvety-smooth appearance. A few months ago I bought a replenishment bag, and there there were quite a few lighter colored grains in it. It was likely just my batch, but examine the contents carefully before buying.
Also, root tabs, plant spikes, or injectcions of liquid or pelletized supplements into the substrate will compensate for any mineral deficiency.