**  After problems with poor quality/counterfeit eggs bought here in the UK ,we are now offering a few varieties which we have tested ourselves - see our "other items " ** . These particular eggs have a very high hatch rate over 24 hrs. They have good separation of deep orange  nauplii and empty shells .What we find most helpful about these is that they hydrate and sink  readily , largely eliminating the usual problem of eggs getting stuck to the sides above the waterline. Just add them an hour before turning on the air . Meant for professional use , in rather plain packs with basic instructions ... 
It is all very well having good  eggs , but if sound hatching procedure is not followed, you will still get a dismal hatch rate .. If you maintain a steady temperature of 24-28 C , with constant rolling aeration and strong illumination , in a suitable hatching solution , you should not go wrong .I share two pictures of my high tech hatching apparatus - a cut-off 2 litre milk bottle , clipped to the side of a cherry shrimp tank ! You can stuff the airline down the handle so that it emerges again right at the bottom middle . You should add them to the hatching solution an hour before turning on the air to give them time to hydrate and sink .Do not use an airstone or dechlorinator . Being in the fish tank ensures a steady temperature and the aquarium illumination does its' job .  Should be kept in the 'fridge. We are using a hatching solution of 25g salt and 2g bicarbonate of soda per litre . Thanks for looking !