Hey Robb, sorry to hear about your troubles. I haven't read this build thread until just now. Imo, most of your troubles are because of the dry rock. It takes a long time for dry rock to populate like live rock, and the less live rock (more dead rock) the longer it takes. If you go 50/50 live and dead it will take about a year for the rock to really be considered live imo. I think you're looking at quite a long time. No algae is a bad sign. If you can't grow coralline, you probably can't grow corals.
If I were you I wouldn't waste any more money on water changes. If there is no significant uptake of calcium, alkalinity, and magnesium, and no nitrate build up I would cut back water changes to no more than 10% per 2 weeks. There is no point in doing them. I would take the money you save doing that, and go buy 100 lbs of good quality live rock off the classifieds on here for $4/lb. Just make sure there are no aiptasia or bubble algae, or other nasty stuff. Stuff that all in the tank for at least 6 months, and then after that you can start removing some pieces to go back to the look you're going for.
JMHO. Hope it helps.
