Question regarding St. Aug treatment with Celsius/MSM Turf

I applied Celsius Xtra to my mainly St. Aug yard (a decent amount of common Bermuda has taken over a few places) last week. I am planning on hitting it again next week or the week after. My question is, should I hit it again with Celsius or use MSM Turf this time? I do have some nut sedge in a few places I would like to take care of, so that is why I am considering the MSM Turf. Not sure if that is a good idea or not though.