OK first off i have many tanks that i have had over many years now, i use to work in the business back in the late 70 up though the 80's ..every tank i have up and running has be sett up by a natural cycle meaning i add no enzyme's of any kind other than fish food and the fish pooping... i remember when i worked in the hobby we sold a product call fritz zyme #9 if i remember right ..in my opinion the stuff was junk ..and in the long run could bring on bad things to your tank ...many years have passed since then.. for Xmas my wife got me a 75 gal to add to my hobby ( what a nice wife ) the place she got the tank also sold her a bottle of Stress Zyme ( bio filtration booster ) i am still a strong believer in a natural cycle ...any input on this product i can't make my mind up if i should use it and y?