lol i had that problem too but mine seemed a little redish not green...i dont have lights on my living room lights up all day sometime i turn on my lights.. but when i do a 60% wc i clean my filters and clean my gravel water gets filthy..in about two hours clear but then week later starts again...but the problem is that i didnt clean my filters rigt after the water change because in 5 hours that i had it on after wc filters were dirty so i cleaned them and now it takes longer for me to do a water change...i have a water softener at home but when i use my tap water it seems to last longer.....
so might help to clean your filters a few hours after a wc....sorry long reply..
No worries many people do that, sometimes people do like a page or too of a reply or post...