This is my first brew. I have a batch of hard apple cyder in a five Gal. carboy. The air lock stopped. I tested, specific gravity it was 0. I wanted to back sweeten so I added Potassium Sorbate as directed then 1 campden tablet. I then used Super Kleer. The cider is very clear after 24 hours but there are globs collected in a ring around the top on the surface and globs are floating and falling up and down. Do I need to add Pectic Enzymes? what is this & what do I need to do? Please HELP