my tank is 120 gallon (24x24x48) 1.5 inch sand bed,100 lbs live rock,1 clown,1 yellow wrasse,2 chromis,1 foxface,1 dogface puffer,1 boxfish so far.sump is 20 gallons.
I hope to start adding more fish and a few corals soon.
For most marine setups and espescially if you plan on keeping corals, you want a turn over rate of atleast 10-20x the tanks volume, so, atleast 1,200 gph - 2,400 gph of water movement.