This is my third year with guineas. The first two years, I didn't see much of a difference in the tick population. This year, I have only seen a few ticks. I assume they took care of a large part of last years breeding population, so this year, there aren't many around. My guineas are pushy around the treats and scratch, but I've seen no fighting between my roos and jacks. You should be fine. I have one guinea hen and 3 males. They are the funniest things to watch, especially when they chase each other around the house for hours. One thing to be prepared for is the initial noise.