I think most advanced hobbyists can tell the difference between false pearling and true. The key is not the pearling, but is there real growth differences?
But the whole issue is HD and others are noticing excessive pearling, more so than normal. I don't think anyone going to dispute the whole algae part.
So what is in the tap water that is causing better growth compare to EI water and Co2 injection? Also keep in mind that everyone's tap water is different, I know I don't notice any difference at all but than again, I have two very small tanks.
Again, the main question is :
What variable are we missing out? If we're providing all of our plant's need, what is missing. Let me know so I can run out and buy it.