If you don’t have a brine-shrimp net, you can find on on Amazon. A brine-shrimp bet greatly simplifies the process of separating the hatched eggs from the nauplii (baby sea-monkeys) as well as retrieving the nauplii from the old tank water, so they can be moved to your newly disinfected tank, etc.

I use this one, personally.

Amazon - Clscea Aquarium Baby Brine Shrimp Sieve Eggshell Separator Artemia Collecting Net Kit 80 Mesh 200 Mesh for Brine Shrimp Hatchery: https://www.amazon.com/gp/aw/d/B09FL6L9WR