Before cycle stats 5'10 185lbs 15% bf

Week three of
40 mg Dbol daily
100mg test prop eod
400mg cyp a week

Diets good, sodium intake is low, drinking plenty of water

3 weeks from cycle start:
I am 200lbs and look like I am 20% bf due to bloat

My AI source at the gym was using gear and AI bottles and reselling after replacing with bogus stuff. He scammed me and a few others, and my AI over the last 3 weeks has been nothing more then bitter water.

Anyway I ordered and received arimidex today which is a 1mg/20 ml bottle

What dose should I run the arimidex and how frequently? Also how long to notice the bloat go away, and how will I know if the dose needs adjusting?

Any help would be appreciated