Yes, you can overdose and kill the fish, if that is what you are asking. Instead of using a chemical repeatedly, do a 30% water change, which is the #1 best thing you can always do for a tank. Vacuum the gravel well too. Make sure you change filter media monthly, and since this is a goldfish tank, we would recommend at least a 10% water change every couple of weeks or the 30% once a month. When you do the initial water change, add SafeStart Plus along with AquaSafe Plus. If you are using a different water conditioner from AquaSafe Plus, then wait 24 hours and add the SafeStart Plus. SafeStart Plus will boost your biological filter and help finish clearing the tank.
Date published: 2017-05-23