Hubby made the chicken door frame very nice, and that's why we don't have an auto door on that one, as he'd have to tear it down.

Now we've got four breeding pens he took pains to making sliding doors for, that are on ski ropes so from the inside I pull the ski rope and up or down they come. We've got a garage door opener he wants to incorporate them all into when he's got time.
That's probably not mold, but scoby per se, like a yeasty thing that grows on top of the ferment. I had some of that on mine and sides when I did it in the bucket. I'm back to doing jars though since I last posted that. For some reason I'd rather just feed them 3-day old ferment from clean jars, and every day it's the same.