I have a 5g container that has had some "reserve" saltwater for a change. It's been about a week and a half, maybe two. Is it ok to use this water still to do a change out? Does it become stagnant or anything like that?
Not that I know of. Might put a powerhead to get some oxygen in it. Though I know alot of ppl make saltwater and store it in containers so they have some made for an emergency.