Thank you all for your reply to my questions.
Ode, you are right, my electrodes were quite close to the wall.  
 
How much distance should the electrodes be from each other?  And how far should 
it be from the walls and the bottom?
 
Thanks.
 
Melly
--- On Fri, 7/30/10, [email protected] 
<[email protected]> wrote:


From: [email protected] <[email protected]>
Subject: silver-digest Digest V2010 #658
To: [email protected]
Date: Friday, July 30, 2010, 6:02 PM