It depends on your body and its tendancy to aromatize test into estrogen. If you find that you are starting to hold a lot of water and (or) your nipples are getting sensitive, I would start an AI like arimidex (.5mg ED) or letrozole (1.25mg ED). If that takes care of it, drop your dose each day by half and see if that's enough. If it gets worse, up your dose to .75mg Arimidex ED or ~ 2mg letro ED and see what happens. You have to play with the dose to see how much your body needs for a given amount of gear, if at all. It took me numerous cycles to find the right dose.