My thoughts:
DSB's in the sump itself are a royal PITA. Eventually you'll need to clean/service it, and siphoning sand out of a sump tank that sits on the bottom is nearly impossible
. best to have a remote deep sand bed in a 5g bucket instead 
DSB's in the sump itself are a royal PITA. Eventually you'll need to clean/service it, and siphoning sand out of a sump tank that sits on the bottom is nearly impossible