My man concern is always. How is it prepared and what other tanks are near by. Ick aresol is always a concern. Is this product in fallow waters? I use to seed my tanks by scrapping pieces of coralline in the return flows. Or taking plates of it. Put in baggies crush is up into powder water like. Turn off pumps sprinkle across the rock scape. Let settle for an hour turn back on system. I would try arc. Just to get som either varieties . I would take scrapings from fallow systems only. Just my parianoa