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Is it absolutely necessary to put some other type of substrate
underneath the gravel of an aquarium to grow live plants? I've been
searching for this answer for months now, and still I get mixed replies.
A local pet shop owner has told me he's ordering some type of special
matting that lies under the gravel and provides a mess-free base for
roots to grab onto and receive nutrients. Anybody ever hear of this
stuff? If so, does it really work? I'm a little dubious about it myself.