I guess it depends on the rocks you have..(density and shape) But I would not think so.. for example in my 20 gallon tank I have 38 pounds of live rock.. it still gives me room for corals and fish.
(I just love live rocks!!
My 75 has 120 pounds of rock. Lots of room left. Just be sure when you put it in you leave space on the substrate for corals that like it on the bottom. Seems everything I have wants to be on the substrate.
hey lion fish that would depend on the aquascape you would do in your tank i have 300 lbs of fiji show peices in my 110 it is perfect for my taste not to full not to empty