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I was looking through a really old book on aquariums and the writer advised putting down three layers in a planted aquarium. 1 was soil, 2 was sharp gravel/grit and 3 was rounded gravel. The grit was to cover the soil and I assume this design is to dissuade digging fish from upsetting the soil and roots while they could happily poke about in the top layer.NancyD wrote: CLS, I understand the soil's value to plants, my main trouble is with digging fish on soil that can get stirred into the water column...
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