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acid water and algae

i mentioned the same thing to kean huat recently when he was here in 
tannin in water=no algae
what exactly is the reason i do not know

on the other hand in mangroves where there is high tannin in the water 
column there is a fair amount of algae as well although the water looks 
brown rather than green.
but then again being brackish it is no longer acidic.
maybe the algae is there but we do not see it, but i don't think that is the 
maybe it just blocks sunlight .....



>Date: Sat, 24 Jun 2000 16:45:44 -0400
>From: "heinesen" <heinesen at idirect_ca>
>Subject: acid water and algae
>This is interesting.  As a matter of fact, I was going to ask about
>something similar, because while checking the weather channel this morning
>(more rain, rain, rain, but I digress...), a gardening expert named Art
>Drysdale was talking about his outdoor pond.  He uses some products from (I
>think it was) Sera in order to make his pond water more acid.  His only
>reason:  to prevent algae growth!  I imagine peat would have a similar
>effect.  Does more acid water really discourage algae?
>Dwight wrote:
>Diana Wastad's Ecology of a Planted Aquarium Book
>http://www.floridadriftwood.com/alecologyplantedaquariumbook.html seems to
>support the hypothesis that decaying peat not only provides your aquarium
>w/ Co2 but also releases algae retarding chemicals overtime.  I
>consistently noted how I have not had a green water problem in my
>predominantly peat / vermiculite substrates snce I've been setting them up.
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