[APD] Re: Dirt and how to enrich an established soil tank

["Bill D" <billinet at comcast_net>]

I have two rather basic questions.

First, when we talk about the desired thickness of the soil layer of the
substrate, are we talking about the soil as it is poured from the bag or
after is has soaked for two weeks?  My guess is that an inch of dry soil
would reduce to about a quarter inch or less after soaking.

Second, I've seen both top soil and potting soil mentioned as appropriate
substrates.  Are they?  Top soil is low in organics and, I guess, its
mineral content could be just about anything.  Pottting soil has more
organics.  Potting soil also usually has nutrients added to it.  Does this
raise any issues?

Thanks.

Bill

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