monofilament line(fishng Line) will errode in light..if you want a line that won't errode use flourocarbon line. a typical clinch knot will work to hold down your plants. you can buy line in leader spools.
btw, some monofilament line is treated to be seen in the water.flourocarbon is not as are lines that are brown or dark in color. some lines are flourescent( blue).
btw, some monofilament line is treated to be seen in the water.flourocarbon is not as are lines that are brown or dark in color. some lines are flourescent( blue).