I gut load brine shrimp with spirulina and Selco.
Adults can be gut loaded in about one hour. Just place the brine shrimp adults in a container of salt water with a little Selco added or "fog" the water with spirulina. In an hour, rinse the brine shrimp in fresh water and feed them to your tank.
If you have brine shrimp nauplii, you have to wait about 24 hours before you can gut load them. The nauplii in the first stage have no mouth or anus. Once the first molt occurs, the second stage nauplii can be gut loaded in about 24 hours.
To gut load the nauplii, add the Selco/spirulina or food of your choice to some salt water with the nauplii, and after 12 hours, do a water change and replenish the food for the second 12 hours.
After the 24 hours of gut loading, rinse the nauplii in fresh water and feed them to your tank.
For gut loading spirulina, I use flake food crushed up as fine as possible and place the food in the centre of a dense piece of cloth.
I fold up the edges and twist the cloth to make a "ball" of the spirulina. Fasten with an elastic.
Soak the ball overnight in a mug of salt water, and then massage the ball while it is in the gut loading container and gradually the food will start to flow through the material and "fog" the water.
Keep the "ball" refrigerated.