dsb info

Hi, I am planning to have a sump with Fug. that have live rock and 4"dsb. Is there any problem having a 4" dsb in a fug.? Please help. Thanks

My reasoning behind this post is kinda simple every time that I hear someone reference a DSB it's always forementioned or predetermined that the beds depth ranges between 3-5 inches or more. however my bed currently averages 1.5 in every location except for the hills that i create for...