Unlike a rose, live rock by any other name is not the same and may not smell as sweet either. Some live rock is much more porous and less dense than other live rock. For that reason, 60 lbs of Marshall Island or Kaelini live rock might occupy as much space in an aquarium as 70 lbs of Fiji or 100 lbs of Gulf of Mexico aquacultured live rock.
I don't care for dense live rock myself. I prefer the light, porous live rock from the South Pacific. When deciding how much live rock you need, you have to think in terms of the volume of space you want it to occupy rather than its weight. As far as I'm concerned, 25 lbs of live rock that occupies the same space as 40 lbs of another type of live rock is not only lighter (and possibly cheaper in total cost) but better.
I have used Kaelini, Tonga Branch and Fiji Buna Branch. I loved the Kaelini and the Tonga Branch. I did not like the Fiji Buna Branch. If I were setting up a 210-gal tank, I would probably start out with something like 150 lbs of Kaelini (or similar) and 50 lbs of Tonga Branch. You can always add more rock later on if you think you need more. I started with too much live rock and had to take some out. I had 175 lbs of live rock in a 120-gal tank and that was way too much. Even after I reduced it to 150 lbs, it was still a little too much. This is one of those personal preference things.


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