I seem to be having great success with milk kefir, so much so that I have two unused jars of it in the fridge. I also just put the new batch in the fridge to slow it down.
But what I don't see is much growth. I didn't expect much in the first few ferments, but maybe I'm not doing something that would encourage reproduction. I only have about a teaspoon of grains and I feel a little apprehensive about having all of my grains in one basket...