its arcadia series 3 2 x 400 halides and 2 antic blues really pleased with them! put two corals in at weekend and they seem to be thriving! only concerns are my calcuim levels at 530-540 and i have not added any??? all other tests fine and salt levels fine! only thing i can think is half my water is natural see water and half that we have mixed up red sea coral pro, wonder if the natural sea water was high in calcuim cause we never tested it??