IMO a
DSB is nice but over time it may break down and you will see the dark lawyers of the denitrification and
IMO it looks like crap. A 2-3" SB is plenty with 1-2 lbs per
gal of
LR.
Have the tank drilled for overflows and use a sump with a skimmer, as others have said adds volume and a place to hide the skimmer and heater.
If you want to have large fish you will want to have swimming room so having 200-300 lbs of
LR will limit that swimming room and displace water volume.
So you will need to decide before you buy the
LR on what type of set up you want, mostly corals with a few fish a mix or fish with a few corals. Some tanks are nice looking packed full of
LR but I like the open look with caves and tunnels with plenty of swimming room. I want a fish tank not a
LR tank
Keep doing the research because it will pay off in the long run.