ITEM NAME:Fish Egg Incubator Tumbler Aquarium fish farming Cichlid Instead mouth breedD4R1 Fish Egg Incubator Tumbler Aquarium fish farming Cichlid Instead mouth breedD4R1 The purpose of an egg tumbler is to allow fresh water to circulate over cichlid eggs that have been separated from the parents Egg tumblers are used frequently by breeders . The gentle rolling action caused by these tumblers can simulate the normal incubation of these fish. Allows egg incubation in same tank as fish are breeding in to provide identical water.The purpose of an egg tumbler is to allow fresh water to circulate over cichlid eggs that have been separated from the parents. 1 x Fish Incubator. Can be used on other non-adhesive fish eggs as well to help prevent fungus.