Left without a food source for an extended period of time it will start to die off. But that isn't going to happen in a day or two. Relax a bit, I promise you won't kill the bacteria.
I am still pretty new to all this too but one thing I have learned is that most of this is much simpler than we first thought. Keep in mind, this is all mother natures doing. She knew what she was doing. If she insisted everything was perfect or things would die none of us would be here right now. She is a pretty forgiving old lady.
Just keep dosing like you are doing. If you miss a day, no big deal. Be patient and before you know it, your tank will look like mine (or hopefully better).
Here is my tank. I started it in July.