I would not recommend running anabolics for 6 months straight. You are just asking for problems. If you were to run a six month straight cycle definitely you will need to change things up. Not just on the steroid side either. You will need to switch to different phases during this period utilizing short durations of AAS, HPTA regeneration, cortisol suppression, and an anabolic time preferably with the use of HGH not anabolics. This will keep your body growing and not stablizing requiring higher dosages and more compounds as you get farther into your cycle.