I know a little about trying to raise brine to adults. I've had failures and learned what not to do.
I started in a 20 gallon long aquarium that had about 12 to 15 gallons of water, 30 ppt, on my covered and screened in porch in Florida. I put in some plankton to start with, about a half gallon worth, fertilizer to grow it, and a cheap LED grow light from home depot. I added an air pump, no stone, just a rigid tube, and used a suction cup and zip tied it, placed it in the center of the tank. It gets morning sun but is shaded for the rest of the day. The light runs about 14 hours to grow the plankton. I let that grow for a week before I add the newly hatched brine into the tank.
For me it takes about 5 days before the brine clears the water of the original plankton. After that I use spirlina powder that I mix with RO water and blend it up before dumping in to feed them. They usually eat that in 12 to 24 hours. After about 7 days you can start feeding the brine to your fish.
The water has no filtration so it lasts about a month before it gets really bad and I have to start over. I usually stagger my tanks. 2 weeks into my current run I will start a second batch in a new tank.
Some tips. Don't hatch more brine than you are willing to feed. I hatched way too many and had to feed the brine every 6 hours. It was a pain.
I use a few seeded rocks in the bottom of my tanks to help keep the water cleaner as the ammonia can be broken down into nitrite then nitrates. Brine shrimp molt and poop so it fouls the water.
Rinse the brine in RO water before feeding them to fish. They can live in fresh water for about 30 minutes.
Don't use air stones or something that makes small bubbles. Brine shrimp feed as they swim, catching food in their legs then pulling it to their mouths. Small bubbles get caught on their legs and keep them from eating.
Once you add brine, you can kill the light. The natural light they get is plenty for them. If you run the light they waste a lot of energy swimming towards it and don't grow as fast.
Any other questions just ask. I rambled and probably forgot something
