Re: [APD] Addition to the surface scum story

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

Very interesting, Tom.

Since you promoted the scum by "removing" CO2, could it be
that the scum you got was CO2 sensitive but that that is
not always the case with scums?

curiously,
Scott H.
--- Thomas Barr <tcbiii at earthlink_net> wrote:
> I forgot to mention that I formed a very thick layer of
> surface scum on the
> water, really thick by shutting the CO2 off.
> 
> After returning the CO2 to the tank at 30ppm, the surface
> scum that was
> there, is now gone after _a day or two_.
> 
> IME in the past, the scum layer often stays in a tank for
> a long period of
> time. This scum was completely gone with nothing done on
> my part except the
> CO2 adjustments.
> 
> A)It could be that the plants leak out some lipid etc at
> a relatively
> constant rate when CO2 stressed.
> 
> B)It could be some bacteria etc in the substrate are
> effected by the plant's
> growth rates or the roots of the plants leak something
> out.
> 
> C)It could be the high Dissolved oxygen levels cause the
> normal layer to
> dissipate much faster even when the plants are in good
> shape for CO2.
> Say the plant had plenty of CO2, but no K+ etc.
> 
> I think A) is the most likely.
> The other parameters have been left in good shape, no
> surface movement in
> the tank, surface skimmers etc.
> 
> Regards, 
> Tom Barr 
> 
> _______________________________________________
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> Aquatic-Plants at actwin_com
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