Of course I have tried Stress Zyme I been in the hobby 35 years...however if you are saying you just pour in a little bacteria in a bottle and your cycled, you are nutz...this only proves you have no idea of what you are even talking about....let alone giving advice to the same...lucky for the OP that he isn't taking lousey advice from you...he would be having nothing but problems, until we got him sorted out...
I have used STABILITY from SeaChem when setting up a quick hospital tank, But not my new MAIN display tank...there is no substitution for a properly Cycled tank...and it doesn't come from a bottle...
And then the what really sealed the deal on your obvious inexperience, was the bit about "just get the small bottle"
"you don't need much"...how rediculous is that statment, not knowing how big of tank this person is even trying to cycle...
Maybe you need to unplug and learn a bit, pay attention to what happens when you make silly mistakes from the start, when setting up aquaria...