I have 3 x250w de 20k halides 12 “ above water surface on a 24” tall tank. Tank is 60” long x 36” wide and supplemented by 60” orphek or3 bars on 12 hrs a day. Most corals are about 20” below the lights. Can’t get any growth. Sps just sit there. Calcium 440. Alk 8.5. No3 10 ppm po4 0.05 mag 1350 temp 78-79 ph 7.8 to 8.1