Turn off aeration for 5 mins and hatched shrimp sit on the bottom and swim around.
Cant use for most fish eggs as the aeration is to viggerous.....
Zogo jar's (think thats the spelling) are good for carp and gold fish eggs, but nothing unless your thnking of rearing 1,000's of fish
Or for mouth brooders u can get egg bubblers to simulate the brooding process