You can also seed live sand into/onto your rocks as you build them for some texture as well as to seed live bacteria and possibly critters into the new structure you create! Just need to cure in salt water to keep some of it alive. There used to be a good site for diy live rock "garf.org" though it seems like they recently experienced a significant loss from their community, and their website is currently under construction. If you click a bit through some of their links, you can still get to their "aragacrete" how to. That stuff was old school to the max, but this mortar only idea seems a bit faster to get a good base for you other stuff to grow on. Maybe I can try to mix the two ideas and post some results pics!!! (PVC structures attach well to sand cast ones I'm sure, and adding aragonite/aquarium sand can only help with natural look and critter populations. The curing process in saltwater may require a separate tank and heater, but I have lots of Rubbermaids laying around, not to mention allllllll the adult beverages I can handle.) CHEERS and good luck y'all!!!!
