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A number of reasons could have caused it.
1. bad eggs - male will eat unfertilized or weak eggs
2. unhealthy male - too tired/weak to tend to eggs/fry
3. lazy male - will only be active (if at all) when with female, but then neglects them (but doesn't eat them)
4. psychotic male - will always eat eggs/fry

If the male is active, glass surfing, after removed from breeding tank, then you could assume he was healthy enough. But you will have to breed him again to determine what kind of father he is. If he does the same thing on the second attempt . . . you'll know for sure.
 
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