Originally Posted by MR MIYAGI
I was just about to ask that
The heat mat should cover 1/3 - 1/2 the viv floor..
If its a piddley thing you may need a bigger one and higher watt...
This one quite easily covers a 1/3 of the tank, I'm just testing it out with a old glass fish tank as I want to make sure it's working properly first, but when my taranium turns up ill be using that