Never put hands into marine water of a home marine system.
Wash hands in soap and smell your hands. Smell the soap scent? This contaminates the water. You can't rinse enough. You can't clean the hands enough to make it safe for you nor the fish.
Human oil does not belong in marine water. It is the kind of oil that encourages undesirable bacteria and isn't removed by the skimmer.
Contaminating the water with hand bacteria and water contaminating the hand can lead to disease in both humans and marine life forms. (You know I've written this before).
I use the long length thin plastic disposable gloves. If I have to move rocks or something that might break the glove, then I use the thicker arm-length gloves. I only do use gloves IF I can't move and do things with aquarium tools. I have quite a glove collection, from short and thick to long and thick and thin.