Short answer: Use what you like, it will not harm TankTechsRx.
Because TankTechsRx uses a living and growing probiotic mother culture cleaning products will have little if any effect in the holding tank when used in normal applications. When sprayed on the cleaning product is at it’s full strength but the moment it is washed down the sink it is diluted beyond its lethal level. The strongest products are chlorine based that require a 10% solution to kill bacteria. That would mean pouring in the whole bottle to do much. If a cup of pure bleach was poured down the toilet it would not have a high enough percentage to be lethal in the tank. IF a few microbes were killed on impact, more will grow to replace them anyway. Use whatever you like in cleaning the bowl or sinks. It will not harm TankTechsRx with that quantity.