"Everyone" says that Neos "do fine in tapwater". Huh... that's funny! They die in mine! Slowly, but surely.
"But once the babies hatch in your water, they'll practically be indestructible!" Nope... babies never survived to adult-hood.
Copper? Nope. Ammonia? Nitrites? Nitrates? Nope. Chlorine? Chloramines? No yet again.
Water too hard? Actually, quite the opposite... it's too soft.
You could blame it on the source of shrimp. The first two came from a pet store, but the female actually survived rather long compared to the others that came after her. Most of the other shrimp came from a local breeder. Same/similar tap waters. So they'd do fine, right? No, yet again.... still died even from the local breeder! (or, rather, hobbyist)
Even after correcting water parameters, I still struggled to keep them alive. It wasn't until after over a year of keeping them that I finally started having a population boom... the one that many people talk about that occurs within 3-6 months of keeping shrimp. Then the colonies got poisoned... twice... first by something that wasn't microwaveable safe... and second by neighbors bug bombing their place. It's now 9 months later, finally having that population boom again... but then again, the tanks were pretty neglected during that time frame.... so now I'm over 2 years of having shrimp... and if nothing goes wrong, that population boom will continue to grow.
So from my own experience, I haven't found them to be all that hardy...