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Don't feed it twice a day if it doesn't need it, which it won't if it's cold where you're keeping it. Quite aside from microbial action being slowed by the cold, you're potentially diluting your stock of microorganisms if they're not feeding and reproducing fast enough, so they'll never really get going. Feed it when it's reached max volume and started collapsing again. If you want to kickstart things, leaving the light on in the oven should provide a warm enough environment to encourage fermentation
A noob question, but any advice on getting my starter to do a bit more in this colder weather? Have been feeding twice a day for the last 3 and not really seeing much of an increase in volume as I'd like.; not passing the float test either...