Without the glass top I get way more shimmer but also more colour separation. With the glass lid as long as there's condensation fogging it up the light blends more but is still noticeably separating. The light is at 8 inches above the glass so about 9.5 inches above the water line. I've tried covering the red an green which eliminates those colours from appearing but the 3d kind of look remains. Without any proper comparison it's hard to know what the problem is. But right now I'm more happy with the look from my 24 inch 2 bulb t5 unit (pictured)

So trying to find diffusion film online I stumble across this forum topic. I've ordered the same stuff he used. Coming from the states so I should have an update some time next week. Thanks everyone who commented :)

http://www.nano-reef.com/topic/29628...through-water/