So . . . 180ppm would be 18 if it was the API test . . . yes, that's hard water all right. Surprising your pH isn't higher. I wouldn't worry about the pH though, mine is actually 7.8 and everyone does fine. They'll most likely adjust to the parameters without problems. Only time really hard water is a problem is if you have crowntails. They're super sensitive to water hardness and it tends to curl their fins. But Comet and Celestia should be okay.
The ammo chips will help and I think . . . yeah, I told you about Seachem Prime, right? That will also help. However, if worse comes to worst and the ammonia becomes uncontrollable, you can always consider an R/O unit or mixing bottled water half tap, half bottled.
Another thing that could really help the ammonia is putting lots of floating plants in. Those suck up ammonia, so plants like duckweed, salvinia, dwarf water lettuce, frogbit . . . all would help.