Ive raised and kept PCF for years.....in a tank they tend to huddle up all over each other in the daytime, then they will separate when they are hunting at night......when ive released them they are solitary and and have only seen them alone in my backyard when I spot them... around Jan-June they congregate at my little pool of water in the yard at night and dont like any company...they fight alot for their space.....