So happy to have found this. As a beginner, have a million questions and the aquarium keeps changing giving rise to new ones. I have a 55 gallon tank with 3 black skirt tetras, 4 angels, 3 zebra danios, 2 platys, 1 Chinese algae eater, 3 red eye tetras, and 6 neon tetras and lots and lots of very cloudy green water. Yikes! The fish seem happy and healthy though so I don't think my problem is toxic. Just quite unsightly. I was changing about 20 percent water weekly. Should I increase frequency of water changes? I'm also leaving the lights off and only feeding minimally. Any other ideas?