I use kosher salt or pickling salt to hatch my BBS and get about 80% hatch within 24h-starting at 85F-I don't use any added light-just an air pump and airstone in my homemade hatchery I made out of plastic peanut jar half gallon in size-I drilled a hole in the lid for the airline hose-add 3tlb of salt 85F water-eggs-airstone-and place in my china cabinet
To harvest-I remove the airstone and lid-then place the hatchery on top of one of my tanks to settle-about 10-15min-then I use a piece of airline hose I have attached to chopsticks and siphon the orange newly hatched BBS through a brine shrimp net I have place it over a empty container to catch the water=once I get what I need-I pour the salt water back into the hatchery and rinse the BBS in the brine shrimp net under running water-then fill the now rinsed container with dechlroinated water and place the BBS while in the brine shrimp net to suspend in this water and use an eye dropper to feed
I condition the fry to a feeding tap....I give the rim -not the glass- of the tank a few taps then add the BBS from the eye dropper...within a few days the fry are conditioned to the feeding tap and anytime they hear/feel it they come running-this help ensure most are eating, ease for observation, counting, health check...etc.....
If you started with half full tank-once you start adding food-daily remove half gallon and add 1 gallon replacement water-until full-once full-start making 50% daily-if cloudy of foul water-make an extra 50%...be sure the replacement water is like temp and dechlorinated for the full volume of the tank-not just the replacement water...