So, I am using a 2000mL flask for a 2000 mL starter using WLP099 (super high gravity yeast), on a stir plate.
I am two stepping the yeast in order to get one big ass starter for a big ass RIS (1.133 OG). I already did a 1500 mL starter, and it had little to no krausen. Now, today I decanted the beer on top and pitched a 2000 mL sized wort onto the yeast cake. This time WLP099 is going nuts. The krausen has pushed the foam stopper out on one side, and is slowly seeping out the side of it.
My question is this: Should I leave it how it is? Or do I throw a blow off onto it? I know blow-offs are usually a big no-no due to oxygen being unable to get to the swirling starter. Also, I figured the vacuum from the stir plate would suck up the star san as well. As a result, I just left it with part of the foam stopper covering the hole, and the krausen oozing out one side.