Sorry RedBlaze, I didn't meant to hijack someones thread.Sweetgecko its not exactly polite to hijack someones help thread.
Moe&Mel:
I purchased this exact UTH for a 20 gallon long Viv:
http://exo-terra.com/en/products/heat_wave_desert.php
and purchased this exact dimmer from lowes:
http://www.lowes.com/pd_70717-539-T...uctId=3189447&Ns=p_product_qty_sales_dollar|1
I have the dimmer turned almost off and it gets (on the low end) around 86 on full power I think the UTH will get 100+(too hot)
This isn't to influence you to get the ones I did but I've had absolutely no problems yet.