Hey just found this journal. Pretty cool stuff you got going on here! But your LR doesn't look like much more than algae covered lava rock... also have you tried Enteromorpha as a possible choice of algae? Not sure if they do well in brackish though.
One Lee: You really should buy either Live Rock or "Dry Rock". I personally prefer Pukani as it is very porous and gives you the best bang for your buck, along with acting as a great natural filter as it offers more surface area for bacteria to colonize.
PM me if you want a great site to check out so you have a general idea of what I'm talking about.
The Fraternity of Dirt #97Just because its dirt doesn't make it low tech
Emersed tUB clUB #17