Are you sure about the 30' of chain? That seems almost unmanageable for a 18' center console. Remember you have to lift that chain out of the hatch along with the anchor and drop it over the side without dinging the crap out of your hull. I have 300' of line, about 10' of chain and I believe a 12-15lb anchor. I also have a small 8lb anchor and minimal chain and rode for the stern.