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 Les, 
Last autumm I couldn't get 
oak leaves but managed to get Beech leaves which I beleive serves the same 
purpose.  A few months ago I aquired a group of adult Taeniacara candidi 
and wanted to lower my pH in their 36" tank.  Using the leaves the pH 
gradually lowered to the level I wanted pH4.8.  The leaves make a very 
pleasing sight as the adults and fry have plenty natural cover.  I also 
used the leaves in my Crenicichla regani (dwarf pikes) tank as they also require 
a very low pH. 
Helen 
Scotland 
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