Re: [APD] Re: An observation

["S. Hieber" <shieber at yahoo_com>]

This seems to be coutner to what some very experienced
gardeners have experienced.  Not that one can't do without
filters and vacuuming with certain setups, but that
biofiltration of an outside filter can't be put to good use
in other setups.

Scott H.
--- Clint Brearley <clint_brearley at telstra_com> wrote:
> 
> IMO, mechanical filtration is the main difference between
> filtered and non-filtered tanks. After pruning and
> messing things up somewhat, I do a water change and rinse
> the mechanical filtration media in old tank water. This
> removes all the crud from the tank that would otherwise
> be just sitting (or floating) around in an unfiltered
> tank - a great NH4 source for algae. Just because you
> can't measure NH4 with hobbist test kits doesn't mean
> it's not being produced in great quantities. Uptake by
> plants and algae simply matches production.
> 
> As for biological filtration, it can't be avoided. The
> leaf surfaces in a heavily planted tank would provide a
> huge for bacteria to colonise. I suspect this is where
> most of the biological filtration takes place, thus the
> main function of filters in planted tanks is for
> circulation and mechanical filtration - not biological
> filtration (refering to low to moderate fish loads here).
> 
> Clint Brearley
> Melbourne, Australia
> 
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=====
S. Hieber

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