Reidi can live for the first five days without food. If they are lasting that long it has to be nutritional.
IME the best first food was rotifers. They are fairly easy to culture, but becareful not to place them to close to your green water culture.
I kept my reidi fry in green water for the first six weeks so I did not enrich the rots, or bbs during this time period.
There are also several types of small pods that can be a useful first food, but IME they are diffucult to culture in large numbers so it really depends on the amount of fry your trying to raise. Todd Gardner spoke of these different species at IMAC. Perhaps you can get the DVD on his speech about seahorse nutrition. I did not get it because I'm out of the fry raising business, but did love the IMAC speech about seahorses from last year.
Also IMO cut that line from your refugium. Things that live in your normal water column are quite cpable of killing you fry, that could also be a problem.