Yes 30ml ,,, I got about 10,12 going in total ,I have made adaptions to some ,to see which work better if at all ,,, early days still I see problems ahead for sure ,,, so for instance the ones in the picture have wicks in them and they sit in a cage box that I can dunk ,,, others have lots of tiny drill holes in them ,, a couple just plain old shot pots and within all that there's 3 different substrate differences ,,ie ,, my normal mix ,,, extra perlight and another group with soil perlight and a name I can't think of at moment ,but it is said to hold moisture better ,,
Ille tag you in to my sqft micro thread if you want
Edit they are sugar baker regs from a seed run I selected from a solo cup run I did for this very purpose ,