Hello, we started with only three guinea fowl last year and love them to bits, so few I don't hace to think about eating them yet! Yes aggressive to chickens, but do coexist. Ours are completely free range and roost in tree above the chickshaw. They have not attacked the vegetable patch but I have heard of tat happening occasionally with a bigger group, so fencing in your valuables might be a good idea. We feed them some chicken feed at night. The nesting is an issue as we would like to eat the eggs as welll. When one did go broody last year we tried to move the eggs to a safer place but no joy. This year I plan to fence around her to keep out the mongoose around here as well as the dog. If they eat ticks, I haven't noticed but the locusts are less here and I am convinced they keep the rats on their toes.