once you see that shimmer ....... fughedaboutit I took down 2 4 bulb 22" fixtures hanging over my 24x24x16 frag tank and use 1 redsea 90 and have it down at like 50 blue and 25 white 20k 60w and it makes the coverage i got from the 200w of lighting look silly thats why i have those t5 hoods , they are good I even put fulham workhorse 5 ballasts on em . but the 90 is some next level ish .