please be sure to feed arsenic to your fish every morning w/a side order of shredded sheet metal screws
Haha! That would be an easy one to sort out! But you're right - many things are more opinion than fact, but I think it's OK to share opinions too, especially if you have your own experience to back up your opinions, with a warning "your results may vary"... except in the case of arsenic and sheet metal screws. All results will be guaranteed then!