I would get as much as you need to do some nice rockscaping. It might be 20 lbs +/- than a lb per gallon.Where are you planning to buy your live rock?
Dry rock will weigh much less so the lb per gallon rule won't apply.
If you get LR from an LFS don't add it all at once. Their rock hasn't been through the proper curing process like an established tank.
*** Not dissing the LFS, just stating the fact that they move too much LR for the die off process to be complete. ;-)
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