These may be a little heavy duty for what you need, but it will definitely serve your purpose perfectly. I have a friend who works as a saltwater tank maintainer (going to offices and homes to clean tanks), and he's allergic to shellfish. He uses these gloves because otherwise if he has a tiny cut on his hand and sticks his hand in any of those tanks he can go into an allergy attack.
http://www.aquacave.com/detail.aspx?ID=407
Just a note: I'm not sure if this is the best price, so shop around, aquagloves are sold everywhere.