i have had a batch of fry from my corys and have bought them some baby brine shrimp. to hatch you need to add salt, bubbles and light, but when hatched and ready to feed how do you do it? will the salt in the water the shrimp are in have an effect on the fry as i know corys dont do salt very well. i watched a guy on youtube make his own hatchery then just syringe the shrimp out and feed the fish direct with the water the shrimp were hatched in, can i do this? 

Since all you have to do is cook up a new batch of oatmeal to renew them, it's worth the trouble to do it regularly and avoid the smell. Since you will be getting a small amount it will take a little while to get them growing, but before long you will be able to divide it into two, etc.