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Keeping yeast bottle warm
When I set up my new 55g plant tank in the basement I found
that the yeast in my DIY CO2 system didn't produce very well when
the temperature dropped to 55F. To solve the problem I bought an
eight quart foam bait bucket for less than $2 and but the yeast
bottle in it and a small porcelain socket next to it. I put a 7 watt
bulb in it and cut a hole in the lid to accommodate the top of the
bottle. With the light on and the lid on tight the temperature runs
about 85F. This was a little warm so I cracked the lid open and it
runs in the low 70's and I get good CO2 production.
One advantage of the system is that if the CO2 production suddenly
stops you can jump start it again by adding a little sugar and
closing the lid to raise the temperature. This gives you time to
get a new batch started.