Fish Hatchery box

I designed a container for the early developmental stages of fish fry, with an integrated air tube connected to an air pump. Opposite the water outlet there are deliberately larger openings so that, if the foaming increases, a flow is created to renew the water and prevent the fry from being disturbed, since in the first stages of its development it hardly swims at all.You can use a sponge to block the exit allowing the water flow.