Ok, I'm somewhat new to hobby. I just performed a water change and added some Aqueon water conditioner per instructions on label. Within their label they have written that conditioner " Detoxifies heavy metals, ammonia and other elements released from fish waste." Awesome. Wait a minute. Detoxifies heavy metals. What do they think is in my water that needs detoxified? If were harmful to fish then it's probably harmful to me and my family or unless quantity is low enough that it's not harmful to humans but would be to fish, ok I'll buy that scenario. I live in a boro so I'm certain the water has be treated in some form or fashion. So now is the question that if it detoxifies heavy metal then the liquid ferts I add 24 hours later are rendered useless? One more question that probably will make a seasoned hobbyist shiver, guess what I use for ph down.