I hate to sound "mean", but if you are in a customer position and another customer is doing something, you can do what you did and if that doesn't work simply mind your own business.
It bothers me that people think it is their responsibility to "fix" other people.
Which is why I walked away. I just think its weird that there are so many ignorant fish owners out there. But I guess if something is working for them(though it might not be correct) then there is no reason to try to correct them.