test your h2o, and if all is ok, go ahead with the inverts, they add almost nothing to your load, so they should not be a prob
get a fighting conch, and, suchk some up, that carpet is a PIA, but if i remember right, it sounded like cyano, can be dealt with, if you adjsut your powerheads, and removeit, youwill catch upp with it in a week or so, jsut this time, use the baster to suck it up, not stir it, ok
getting those nassarius, huh?wait til you see thembook, coooooool, they will help some with the sand, by stirring and eating the garbage, but they will not eat algae, like i said, suck some up and adjust your powerheads, often the prob with that type of algae, is no circulation in that area(or little)