80-100+ heads, been in my tank For two years- indestructible, incredibly healthy- this is for the colony seen in the center of the picture- it’s mainly all on one rock in the center and the few on the outer perimeter are just more that have grown that won’t be included. alkalinity calcium magnesium in your reef tank pukani, Fiji, Fuji, reef, fish tank, aquarium, coral, reef, sps, lps, ecotech, eco tech, vortech, vectra, mp40, mp60, reef octopus, live rock, dry rock, branch rock, kessil, tunze, saltwater, skimmer, Neptune, ato, live rock, tunze, jebao, reactor, chiller, heater, Sps, Saltwater tank, Acro, acropora, Lps, mp10, Red Sea, reefer, frags, ai prime, aiprime, mp 40, 60, 10, wqd.