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 conditions during incubation period. Can be used on other non-adhesive fish eggs as well to help prevent fungus Can be used on other non-adhesive fish eggs as well to help prevent fungus Where mould and fungus development is suppressed without the need for chemicals. Material: plastic Color: White Size: 28 x 3.8 CM / 11 x 1.5 inch Package Includes: 1 x Fish Incubator Note:Light and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.