PBennett657;906820 wrote: Thanks
How many pounds of rock would I needs for a 100 gallon tank?
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Recommendations seem to vary widely. The more porous the rock though the lighter it is while still being as effective, if not more, than a similarly sized denser rock. Keep in mind I'm still a relative nub in this hobby but I'd say 75-100lbs of good rock. With really porous rock you may be a little light and that's ok.
Put some thought into this. It's not just x pounds of rock. You need to consider your rock scape. Do you want branches, shelf, or just a wall? Do you want any "bonsai" style pillars?
For my biocube I just bought rock and pieced something together. In the end I didn't leave much space for corals. Look at people's build threads to get some ideas. Read up on the different types of rock available too.