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Would these guys eat eggs or harm small fry in a breeding tank?

Maybe eggs as they scavenge some.

I'm just worried that they might eat the eggs or wigglers at night while the parents are asleep. Does anyone have experice with scuds? I kinda thought they'd make a cool feature to a tank and also work as live food.

http://mdc.mo.gov/discover-nature/field-guide/scuds-and-sideswimmers-amphipods

http://www.fly-fishing-discounters.com/freshwatershrimp.html

Based on the last article I would say they definitely would eat eggs and maybe young fry if given the opportunity. Still a fun organism to keep and breed. Good luck. Jack