(The picture referred to in the following instructions can be found in my albums section ( album labeled " Instruction charts" in my profile page.)
Hatching Brine, this is what I do:
You will need an adjustable heater, a thermometer, a fluorescent light (most brands now suggest light for optimum hatching), some airline, an airstone, an air pump, non iodized salt, a container (preferably glass) that can hold at least 1/2 gal of water and water.
Make the temp of the water between 88 and 90 degrees.
Make a solution equal to 5 tablespoons of salt per 1 gal of water. (2 1/2 Tablespoons per 1/2 gal of water)
Make sure airpump is pumping enough air to circulate the bs eggs and they don't cluster on the bottom.
Make sure airstone produces larger bubbles or airline has a weight to hold it down at the bottom of the container. Position the end so that the water circulates in a circle.
This is my steps to having live brine within 24 hours:
My heaters are already set to the temp and I just place them in one of the other BS jars when I clean and set up a new jar. (I use 3 jars)
I add the water, the right amount of salt for the amount of water (This pic is of a 1/2 gal glass bowl so it gets 2 1/2 tablespoons of salt), the eggs.
I take the bowl back outside (I keep mine outside) and put the heater back in the bowl, the airstone back into the bowl, cover with the aluminum foil top I made to stop the splashing then go about my business. By the next day, I have live baby brine shrimp. Use immediately.
You'll notice the light is behind the bowl and I am not using an airstone but an open airline with a weight at the bottom. Anyone telling you it needs to be more complicated than this is full of crap and doesn't know what they are talking about. NOW, the reason the salt level works is because of the high temp. Colder water will make this solution higher in salinity so you would need to lessen the amount of salt if you turn down the temp. (Use a converting program online to see what the salinity at 90 degrees is equal to at the lower temp.) HOWEVER, colder temps make the BS take longer to hatch so why do that?
( I have used everything from Morton's non iodized salt to Kosher salt to Aquarium salt to sea salt with the same success. Just make sure you are not using table sale that contains iodine.)
As to how much shrimp to use, that will be determined by how many fry you are trying to feed and the hatch ratio of your eggs. I generally feed my fry 3 times a day so I make 3 bowls of shrimp at the appropriate times they are to be fed. This way, the evening shrimp will still have the same nutritional value as the morning shrimp.
Feel free to PM me if you have more questions.
Hope this helps