How big is the pot? I usually start them in community 4" pots, one in each corner. You don't need to "rip" them out. They're pretty easy to separate and up pot, UNLESS the seed stems are touching... In which case, I would use nail scissors or embroidery scissors to snip off the weaker one.
Make sure they're getting enough light -- indoors they should be kept approx 2~4 inches under a CFL bulb or tube for 14~16 hours per day.
That said, if you live in Pa, you're planting schedule is probably similar to mine and (I think) it might be a tad early to start cauliflower for the fall crop ... unless you get first frost by end of Sept?