Just play around with the first calculator and you will see how dangerous it could be if someone just say false if anyone report these figures. Just use this automatically with references to other aquariums without knowing any more background about the actual aquarium should be included in the 7 deadly sins - IMOI think it is a matter of how they are acclimated to it, or species tolerance. I personally have lost some fish at these .5 levels.
Sincerely Lasse