Yes, whichever conversion table you use, 197 mg/l calcium carbonate does convert to 11 german deg.
But 11 and 12 are close enough for our purposes. However, I have soft water so I'm afraid I don't know much about hard water fish. Looking at Seriously Fish, it seems that your hardness is right at the lower end of the ranges of the fish in your list. I would prefer to see a hardness nearer the middle of their ranges.
But I would take more notice of people who know more about these fish that I do.