I have a 20 gallon tank and 3 plants...Madagascar Lace, Ludwigia - Broad, and Ludwigia Needle Leaf. Problems is the water is cloudy (looks green). Tank was clear before I put them in. Are the plants the cause of it? I have done several 4 Gallon water changes and nothings is working. I have purified water with reverse osmosis. I have LED full spectrum lights. Do I have to remove plants?