You wont lose muscle mass if your diet is on target. You will loose water weight but that is about it. There are plenty of guys on here including myself, that come off cycle and do not run pct. I think it is a personal choice, some people shut down hard and some do not.

Pct can consist of Nolvadex. 40/40/20/20 This means the first 2 weeks you take nolva every day at the mg listed 40. Then the last 2 weeks 20mg each day. The pills come in 20s.

So depening on how you feel, it is up to you. Somtimes i like to and somtimes i do not.