beware of the water that you buy from LFS...even though their claim is that their water passes through UV or already filtered.
I used to purchase water from different sources & had always experienced some problematic water parameters, diseases & ionic imbalance.
Eventually, I decided to try mixing my own seawater now using Marine Env salts...& no regrets since then !
My fishes & corals all happy & most important I know I have control over the quality of seawater.