[eeji]

Tubular heaters are handy for providing back ground heat

http://www.screwfix.com/app/sfd/cat/pro.jsp?id=51805&ts=56282
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i use 2 of the 180w versions of these in clydes viv, located at the bottom, with spot lights at the top.

 

[eeji]

i got mine on a pulse stat, and along with the lights the viv (6'6" x 4' x 8') is kept at between 26-29 deg