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Re: [APD] old soil substrate
--- Jim Seidman <js5 at seidman_net> wrote:
> Walstad's method, at least as I interpret it from her
> book, has you feeding
> enough fish food that it can provide essentially all of
> the nutrition the
> plants need. The soil is useful because it provides a
> reservoir for these
> nutrients. Thus it should work even if the soil only
> contains, say, a
> 6-month supply of a given nutrient. At any given time
> much of a particular
> nutrient is not bioavailable. Thus the fish waste slowly
> replenishes the
So the soil is just a buffer for when you don't put in
Fishfood is cheap and doesn't mud up the tank when you
transplant, why not skip the dirt and just feed the tank?
> If you don't feed enough, the soil will become depleted.
> How fast this will
> occur depends on how much you feed.
Days, months years? Depends onthe soil? -- which, btw,
takes us right back where we started ;-)
> The fact that Josh got over a year out of a coffee can's
> worth of soil in a
> 50 gallon shows how great soil is at paving over
If that's what happend.
> If he had used a
> 1" layer, he'd probably have gotten years of great
Or lots of mud or algae or both -- I would think that dirt
tanks are best left undisturbed.
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