Hello I am looking at the ways everyone keeps there water change and top off water and how long. I am planing to have a 32g brute filled with Ro/Di water with a Mag 9.5 pump in it to mix my saltwater for changes how long will this keep in a hot garage? and a reserve container with just Ro/Di water for top off about 30gallons at any given time. no movement will this go stagnet? Input on what works for you would be great, Thanks