I am planning to do mix reef on reefer 170. Dimension: 24(L) X 20 (D) x 20 (H). I am debating should I go with 1 Kessil 360 or Hydra 26HD or 2 Kessil 160. I am leaning towards 2 Kessil 160 as it would have the best coverage and eliminates any shadowing effect, but I think it would be an overkill for mix reef of this size. Please let me know what you guys thinks.