Did you mean to quote me?Wow. You have a lot to learn.
Fish thrive in their natural water conditions.
Staying on this topic...while I agree that fish can adapt to different pH/GH/KH levels other than their "natural" one, there are limits. Trying to get a fish to adapt to any different level is going to be stressful no matter what, and the bigger the difference the more stress.
Of course this all depends on the OP's current conditions.