Container for raising young fish. Provides the young fish with plenty of swimming space for rapid and healthy growth. The fine structure of the vessel allows water to penetrate while protecting the young fish from their peers. It has a capacity of 2.5 liters and is also suitable as a breeding container. The Sera breeding tank is suspended in the aquarium. The fine mesh structure allows water to flow in while keeping the young fish separated from their peers. This is necessary because ornamental fish often see their own offspring as a food source. However, in the Sera breeding tank, the young fish are well protected and can grow up carefree until they reach the size needed to coexist with the other fish. The breeding tank holds 2.5 liters, providing the young fish with ample space to swim.