Good to hear you're gettin' somewhere
Rock is a personal preference, based on what you want your tank to look like.
1-2lbs/g is the normal recommendation
1lb/g is heavy if you want a light 'scape and have a light bio-load, and some say 2lbs/g is needed for a full-blown reef with lots and lots of SPS etc
You can mix live and base, but the more base you use, the more quarters of the year you will wait for it to fully seed
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