I wouldn't put one tetra in there alone, but would put them all back.
I"ve never kept diamonds, but if they are fast and not nippy, they'll do very nicely.

Is your tank large enough for them to keep out of range of the Kribs?
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Moms sometimes will kill the Dad to protect their babies.
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Yes, this can happen. Their need to defend their young is very strong, and they may turn that urge unto whatever is handy, including their mates.
Just want to make a distinction between "dither fish" and "target fish": Dither fish are active fish who swim around in the open and encourage shy fish to come out of hiding.
"Target fish" are specifically used to draw aggression away from breeding partners.
My target fish were fast and fairly large. They kept my breeding angels busy, but were too fast to get hurt by them!
I hope we can see pics of the proud parents showing off their babies!

I love Kribs!