Hmmm. I thought stress zyme was something else. Let me research it I'll get back to youOh. The products are very confusing. The stress zyme states it “contains millions of live bacteria” that “help boost the natural aquarium cycle” and to use weekly. So I thought contained live bacteria. Is there a site that breaks down these products and when to actually use them? I have some safe start, so I’ll do a water change and add that. Is water changes the only way to get you ammonia down?