Bolivian rams would not do well in your water, their hardness range is 18 - 179 ppm (1 to 10 dH) while your tap water is 265 ppm/14.8 dH.
Cherry barbs would work, hardness range 36 - 357 ppm.
Zebra danios would also be OK in your hardness but they need cooler water that most fish in stores so the rest of the fish would need to be chosen for compatible temperature.
There are few tetras that would be happy in your hardness, x ray tetras (Pristella maxillaris) being one of the few.
Some, but not all, the species in the genus Pseudomugil would work, though they are small fish and may not mix well with the molly you want to keep.
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By the way, never ask advice from a fish store. The vast majority of workers in them are trained in how to make a sale and nothing else. Very few actually know anything about fish. Ask here before buying anything, we aren't trying to make money from a sale.
Sorry @underthesea1 for mentioning this in your thread. I live in the south west so water is neutral but my friend lives in a hard water area and is keeping electric blue rams, cherry barbs, a few dwarf rainbows. Which seem to be doing okay. His 3 lined cories haven’t done so well but that might be because of supplier.
I think water parameters makes a difference but a lot of popular species have adapted as long as you don’t buy wild fish which Maidenhead aquatics don’t normally do.
