My water was looking the same as yours. I have a 270G. For filtration I was running a wet/dry (1200GPH) with 50 micron filter media and 2 XP3s loaded with filter floss and my water still looked like yours (no overfeeding, not overstocked, weekly 25% water changes and all water conditions were ideal etc). I tried leaving my lights off for a week, but the algae bloom persisted. My tank had been cloudy for over a month, so I finally gave in and bought a product called Algae Control by Tetra. I added the recommended dosage and my tank was crystal clear within an hour. My fish were fine- no adverse effects (I have no plants though, so I can't speak to how plants would react to the treatment). Assuming you've done all the maintenance I referenced above, I'd say give this product a shot (there are mutiple brands, but they all seem to use the same active ingredient).