Before dipping your hand into your tank do you wash with soap, just rinse or something else? I worry about left over soap from under a fingernail or something getting into the tank.
I rinse after, but not before. I don't think theres much on my hands that could compare with what comes out of the skimmer. Others will differ, I'm sure.
I have gloves that go up to my biceps. I'm alergic to shellfish and don't want to take the chance getting any bad ju-ju's in the (many) cuts on my hands.
I use shoulder length gloves. 5 years ago, I scraped up my forearm against a thicket of Acropora in my tank, and ever since then my arm develops a rash if it comes in contact with saltwater. I miss going in without gloves though.