I am starting a 45 gallon reef, and for the time being I am just going to have to find a store with good water, maybe mix it my self. Later down the road i may get a RO/DI system just right now it is more economical to just buy the water, all though it will be a pain filling my tank for the first time. I need to start collecting buckets with lids so i dont have to make as many trips, the 3 gallon bucket i have now will make for a long day and few trips to the gas station