1.) Potassium permangenate, alum, diluted bleach. Research your plants and know what they can take. I use potassium permangenate (I buy Jungle Clear Water), and haven't hurt any plants that I know of. I soak for about 30 minutes in purple water (pink = not enough).
2.) I haven't done this, but I've heard a lot of times that clear fishing line is great.
2.) I haven't done this, but I've heard a lot of times that clear fishing line is great.