OK playing 55 f/out at cov. 10k starting stack, 25 min clock. Good structure. 100 runners. 1.5k up top.
Blinds are 200/400. I am playing around 6k. Blinds are about to go to 300/600. Ante's don't kick in for another few levels.
Player playing around 12k limps. Button limps playing around 15k. I make up with

(is this a fold pre?)
Big blind checks playing around 10k
Flop comes down

I should?