I am in the process of setting up my new tank, finally I have it in place and will be filling it up over the next few days. I buy all my water from my lfs
but it is going to cost me a big chunk to pay for this to be filled up. To start with I will be having 2 dwarf lions and then putting a few corals in over time but not for the next 6 months or so. Would I be able to use tap water and treat it if I run activated carbon in the tank during the cycle and did a longish cycle?