pick from the following.
(a). Do this an hour after you've fed your fish. If you leave uneaten food in your saltwater tank, it can decay and make the water cloudy.
(b). Eat or discard the uneaten food. Repeat the process five to 10 times if they have a long-shelf life.
(c). Next, remove any uneaten food by piling it in a plastic bag (or lining it with newspaper). Fill it with fresh water (tap water is usually better) and use a dry sponge or soft brush to sweep away any remaining food.
(d). If any food remains, wipe it down with a clean paper towel or throw it away. It can also be a good idea to scrub the tank afterwards with a sponge or brush.Choose from options above and answer: What most naturally follows?

How to clean a saltwater tank
Remove uneaten food.
While you should only be feeding the fish in your tank enough food for them to consume within an hour, there may occasionally be food leftover. Take a net and skim the uneaten food out of the tank.
Answer:
(a).