Actually, No I havent!!! Lol I had let the java fern float in my tanks for 2 wks & tied them to lava rock & stones the third wk. Also my tanks are near my windows so the direct sunlight hits the plants. They have been in sunlight for 10hrs. By the time im out of work the tank light is only for 3 hrs and off to bed I go!!! Lol so no fertilizer jus fish poop!!