[APD] RE: Mulm accreation in plant tanks

[Dave Millman <dave at tactics_com>]

At 01:32 PM 6/1/2004 -0400, "Thomas Barr" <tcbiii at earthlink_net> wrote:


> Mulm is not a good thing really except in small amounts in the substrate or
> large amounts in a non CO2 tank substrate. Too much can be bad and place a
> larger demand on O2 and organic fractions of nutrients which take more time
> to become available to plants. Works well in non CO2 tanks, but in CO2
> enriched tanks, not so well in general.Things move too fast.
> Reminerlization takes some time and less light to work well for plants.


Tom, this is a radical new thought, at least for me. I've been reading your 
posts over the last couple of months about the wonders of mulm, although 
those were all in the context of a low-light tank.

My high-light CO2 plant tank is now 2 1/2 years old. It has always had a 
moderate or higher fish load. The Flourite substrate has never been 
vacuumed, except for surface accumulations (no gravel swirling). It's 
pretty thick with mulm at this point. It's on a 50% weekly water change 
regimen (aka Barr System).

Conventional wisdom is that we don't deep-vac the substrate in plant tanks. 
Does your statement above advise otherwise?




Dave Millman
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