Females tumble them in their mouths, BUT at the same rate there are a lot more place for the fry to hide and get the food they need in the wild. Lets just say I let the female hold in my tank that has 40 Kiriza. What do you think the survival rate of the fry would be? Ten Percent? I tumble because I want to keep my fry not lose them to fish snacks. I know it is a touchy subject but everyone has a different way of doing things. I could on and on about the pros and cons of stripping vs. not stripping but lets save that for another thread
Yes it is a home-made tumbler, A friend of mine makes them and wanted me to try this one, he uses them to tumble featherfin eggs which are roughly the same size.