Ziss Egg Tumbler
Ziss Tumblers are completely new patented fish egg incubators. Ziss Tumblers are mechanically equivalent to the McDonald hatching jar, however the Ziss Tumblers can be installed inside your aquarium and are simply operated by an aquarium air pump which is controlled by an adjustable air valve.
These devices are most often used for African Cichlids (non adhesive eggs), but it can also be used for be pleco and corydoras eggs (adhesive eggs). You can adjust the water flow to tumble the eggs whether they are large or small (non adhesive eggs), or can let them sit and just give sufficient water flow for hatching around them (adhesive eggs).
Ziss tumblers will give much higher hatching yields and save baby fish fry that have been hatched.