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Re:Substrate Heating

Why would you want to mess with the complications of tubing for a 
substrate heating system? For about $25 I  installed a simple 
 substrate heating system in my 55g tank based on the article by 
Dan Resler and Uwe Behle.  Without the heating  on my substrate runs 
1 to 2F lower than the water temperature.  With the cables on 50% of 
the time the substrate midway between the cables runs 1F higher than 
the water temperature. At 100% it is about 2-3 F higher.  I posted 
the details of my system in March 97( #457). Also there are many 
other helpful postings from other people.