I was so unprepared, did not have any micro food, green water. Thanks for everybody's advise here, I moved some plants and gravel from established aquarium and fed them hikari first bites, added some sea salt just in case (I red that some shrimp larvae need bracklish water to turn into shrimp)
I keep them in 2.5 gal tank, no filter, no airstone, just 50% water changes daily. I was afraid to stir up the water and disturb them. Should I put airstone or mini azoo water filter now?