Now that you have decided to do salt water changes, the next step is to plan.
What equipment will you need? How big of a change do you want to make?
Where will new saltwater come from? Make it, buy it?
Make it? How, from what?
Where will you store the saltwater while pump out some old? Remove old saltwater how and to where?
Bottom line. It has to be relatively easy and problem free or you won’t want to do it. Remember, water spills, it leaks, it is heavy.