I've always been a little confused by the two stage starter layout in BS. You have the first stage on the left, then a recommended start size that seems to be for a single stage, then size recommendations for a two stage, then on the right you can set up your second starter. It's not very intuitive.

Anyway, I'm currently doing a starter for a Belgian Quad I'm brewing this week and BS recommends a first starer of 968ml and a second of 1008ml. Easy enough. Just wondering if I should decant after the first stage and add to the second volume or if the second volume should be added to the first?

If it's the first then I'm essentially making two starters that are about the same size and I thought the volume was the most important thing to define how many yeasties you end up with.

If the second is added to the first then the volume will be greater but the resulting starter wort will be diluted and weaker than the first one, which I also understand is something yeast don't like (going from a higher gravity to a lower).

Thanks in advance for you help.