My issues with using RO
water werent with the cost, it was how to get it home, up three flights of stairs and into the tank. When the LFS
charges to rent the container, youll either need a huge deposit to rent several 5 gallon containers, or make many many trips with one 5 gallon container. I don't think I could carry any more than 5 gallons at once up three flights of stairs.
As far as the necessity to use it in the first place, I view it like this: With the price I paid for the life in the tank, I cant afford NOT to use every precaution to make sure everything is ok.......The water cost far less than some of the fish I've considered buying.