Other interesting things to note, and to make things more complicated. You can decapsulate the cysts for better hatch rate, less risk of introducing disease, and obviously no empty cysts for the fish to choke on.
First you hydrate the cysts by soaking them in water untill the dents pop out. The decapsulation is done with bleach, I think 50% but I'd have to check if anyone is interested, stir or aerate for like 5-7 minutes and the cyst shell (brown) will disapear and leave the pink/orange membrane, rinse in tap water, add to the brine water and they'll hatch out.
(this is from memory, so correct me if I am mistaken)