Those numbers would not be relevant presently. Ive used tap multiple times especially when I was just starting the hobby. I really don't think it will disturb anything. You may get an algae bloom. But if I were in your situation I would use it. Make sure to use a dechlorinator. My 2 year old dumped a bottle of essential oils in our tank once, so I feel you.Anyone got a take on how safe this might be?