"Dave M. Picklyk" wrote:

I have a 15 gallon aquarium and keep it 25-30ppm no problem for almost 2
weeks with just regular baker's yeast.

Thanx for the idea about the reptile heating pads...I think I'll do that for
the concrete floor.

At under $100 for bottled CO2, money spent on heating pads and electricity
starts to add up. Just a thought.