I have a Hunter 35.5 that I sail in the San Francisco bay waters. The SF bay bottom is primarily mud, sand and silt. Thanks to a few million yards of waste from the gold mining days, the bottom has a few remnants of deteriorating equipment as well.I am seeking advice on the best anchor for this type of bottom. The vessel was obtained with a Danforth, which has been used in shallow waters, but I'm looking for redundancy, which will ensure the boat's security during extended periods unattended.