That looks good and lively where do you keep it mine lives in the fridge. I only use it now and again. What quantities do you feed.
It used to live in the fridge but it got in the way of other things.
It then moved to a cupboard but out of sight was out of mind. It developed black ‘hooch’ as I’ve heard it called, and it would stink like vinegar as it was starving.
It now resides on the worktop by the toaster!
I do it by eye. I give it maybe a couple of tablespoons of flour and whatever amount of water. Then on a Thursday night I’ll give it maybe 3 tablespoons and some water, the same Friday morning, then use it Friday evening to bake on Saturday morning.
It did go all odd on me last weekend and didn’t really rise. I’d run out of rye flour. I bought some on Sunday and it been perky ever since.
I‘m not great at being bothered to measure stuff, until it comes to the actual dough mixing.
I seem to have hit upon my own technique after following all sorts, with varying degrees of success!