Originally Posted by Dav3
Yes you can mix water that has been made with different salts and yes you can change salts. Changing usually just involves switching salts during water changes.
I prefer Red Sea pro as it mixes super fast(30 minutes to 2 hours) and doesn't leave any kind of film or anything in the mixing container that others here have reported of other salts.
Try putting an air stone in while curing, you will see stuff at the top (film).
I use an air stone with a power head when curing my water just to lift up any pollutants in the water than a paper towel just touching it will get it out.
Also not good switching salt mixes cause they have different water parameters ( reef crystals, normal.....) but its ok if you intend to stick with that brand.