They are there to create a larger warm zone. Considering there's 24 sq ft of surface for him to crawl around on, I wanted to get at least 8 or 12 of that as the warm side (~85 degrees). One lamp definitely wouldn't accomplish that like it did in my 50 gal tank!

On another note, and I hope I am not speaking too soon. It looks like the dirt mixture or 75% top soil and 25% decomposed granite is a good combo. He has already made a nice burrow under the water tub and the dirt is holding 80-85% humidity without me adding any water too it yet.

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