I say yes to more rock. I have at least 300 lbs of rock in my tank. Added it from the beginning and it was all dry rock to begin with. I only used 30lbs of live rock in this tank to seed all 300lbs. The more you can let you fish hide when scared or unhappy will ultimately reduce stress and also reduce aggression between tank mates. I'd say your tank needs at least 2-3x the rock. If you want to have a reef tank you'll need the structure to go from the bottom to pretty high in the tank for sps or high light corals ( 6-8 inches from the top is where mine is at) my acropora grows fast up top and plus my anemone stays on the top of my rockwork and I have 450 watts of halides and 400 watts of power compacts on 8 hours a day. You need caves and cliffs and tunnels for your fish especially if you get an angel. Or anything nocturnal they will need to hide. Also many fish graze on algae off the rocks like the lawnmower blenny, angels, BF, tangs etc. basically more rocks are good