JCR

So my friend insists that putting the water conditioner directly into the tank, then pouring the tap water into the tank is dangerous for my fish. I thought that water conditioner reacts instantly with the water so that the untreated water won't be dangerous for my fish. Can someone please clarify this for me?

COBettaCouple

either way can work, but it's better for the fish if any water they intake is treated. putting conditioner in the tank, then adding the water could leave pockets of untreated water until the filtration system fully mixes the water.