My ghost shrimp are currently in a 10 gallon tank. What I've observed is they love to have things to crawl on. Wether it's the heater, the log in the tank, or the plastic stump that I just recently covered in Christmas moss. They seem to love the live plants I have in the tank especially the moss! Their water is at 79° and they share the tank with a Cory catfish, a gourami, and a Betta fish.