Originally Posted by rightnow

My kefir is sitting on a seedling mat so it keeps it in the low 70s temp.

For fermenting kefir (or starting tomorrow veggies) I use these nifty little silicone inserts I put in the top of the mason jars. 10 bucks for half a dozen. These have a tiny (invisible) slit in the top (that you make sure to crack open by pushing up from underneath on the middle before using). When the CO2 gathers it escapes by pushing up until the tiny crack opens. So no opening/tightning jars.
https://www.amazon.com/gp/product/B072N42T61/