The Tom Steady Hatch ‘N Feeder Brine Shrimp Corral can be utilized in each marine and freshwater tanks. The eggs will begin to hatching in 18-24 hours. Hatched shrimp will swim out into the aquarium water as they mature. DOES NOT INCLUDE the important air pump or brine shrimp eggs. We propose the TOM Stellar S-20 Silent Air Bubbles Aquarium Air Pump and the SF Bay Emblem Brine Shrimp Eggs.