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Re: Booth's heating cable

> Date: Sat, 08 Jul 2000 06:28:34 -0400
> From: Dwight <boukmn at mindspring_com>
> Subject: Re: s
> I should have asked the question differently; Do heating cables work WITH a
> soil substrate?  Keep in mind my soil substrates are a blend of
> vermiculite, peat, clay (small %) and sand so compacting isnt a problem. 

I've only used coils with gravel/laterite and I suspect folks who use soil 
probably haven't used coils. There is probably not a deinitive answer to your 

However, it seems to me a substrate with sand (I'm assuming sandbox-type sand) 
might be prone to compacting. Dupla reported such results with their original 
2500 gallon monster tank. They felt that once detritus got into the substrate, 
decomposed and filled in the interstitial spaces, the result was a lot like 
concrete (after a few years, of course). For this reason, they now recommend 2-3 
mm gravel (1/16-1/8"). Detritus is not able to fill in the spaces as easily.