When it comes to our tanks, I feel like there are so many different methods, additives and ways to go about keeping up with our tank. However, there might be certain things we want to try but are cautious about trying. Maybe it is a new livestock we don't know will do well in our tank, or maybe it is a chemical additive we just are unsure about. I am wondering what is something you want to add to your tank, or have added to your tank that you were/are nervous about?