It's made for new tanks to instant cycle. It is likely too much product/wrong product for weekly water changes.
No, it is not too late to add somthing else. I recomende grocerystore shrimp in a nylon stocking over any so called bacteria in a bottle. Have can live bacteria survive on a shelf in a botle? Ammonia in a bottle can work though.I used that exact product 3 weeks ago in a new tank with fish. So far after daily testing I still have 0 nitrate and nitrite! Is it too late to add a different bacteria starter?
Sorry for asking a question on someone else’s post. Not sure if I should start a new Tipton the same topic?