how old is the pair? younger pair tend to eat the fries. give more time.
is there fighting between the pair? fighting will have this problem too. change the pair if too aggressive.
any sudden changes to the surroundings? dun on-off the light or always go near the tank to look see. esp if this is their first time.
did u get them as a pair or breed from young? if u got it as a pair, then need time for them to accustom to u and the water parameters.
hope my experience helps.
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