I think that's the roughest part about Guineas - they are very aggressive with each other. I know Patti hasn't experienced that with hers - maybe because there are only two and a male and female. Mine were pecking each other in the neck and several looked like prize fighters one morning. I thought it was because they were in crates and it did seem to get better once they are out in the coop and run, but if looks like you have a good amount of space for them. I wonder if it isn't developmental too. I think mine were about 4-6 weeks when I say all of the aggression. Actually, I had 3 incidences when they were 1-2 weeks as well. If it helps, mine did heal up fine and they are doing better now at 10 weeks. I just have issues with the one adult, but I've been told that his behavior is normal, so I'm going with it for now. Good luck with everything - when they're like that, it's hard to go to work and leave them, but Guineas are rough and tough birds. I hope the skirting keeps the raccoons away.