I'll tell you what has worked for me for over 8 years.
1/2-1 inch sand bed
very light feeding once per day. all food is gone within 1 minute
10% water change every 2 weeks with RO/DI water
Only additives used are PH Buffer, ALK buffer and Reef Complete from seachem to maintain Calcium. I don't add anything else what so ever since water changes will replace trace elements.
Lots of people like DSB but honestly I think that it is just a place where stuff builds up and eventually will oversaturate the DSB and cause major problems. It may take a few years or longer but after setting up at least 20 tanks it is a huge eye opener when you pull out a DSB and the water turns to smelly soup from all the crap that has been trapped. Live Rock is more than enough to take care of Nitrates if a tank is properly fed and maintained ( not overdosed ). You have a FUGE also which will help alot. A shallow sand bed also gives you more viewing area and water volume. Now I am not saying that a DSB is the wrong way to go and lots of people have great short term success ( less than a few years ). Very few people have had a succesfull DSB for more than a few years that have not replaced them or moved their tank and cleaned it out during that time.
Here is a picture of my 150 gallon that has a shallow sand bed and large skimmer and that is it.