My water hardness is quite high as well. I do not have an actual number to report for that but i KNOW that whenever i do any kind of testing the results are always in the higher bands. I think that it depends on how you acclimate your fish. I would maybe think about doing half ro/tap then slowly switch to tap. If you are going domestics i like ones from Germany because they seem to be doing a lot less inbreeding and more mixing. I see you already decided on wilds though which should be great 
I wish the best for you and your fishies
I wish the best for you and your fishies