Siphoning can work but will be labor/time intensive to say the least. I had very poor results with FWE, even at almost double strength. WHat did the trick for me was a pair of Blue Star Leopard Wrasses. Not only are the visually stunning, they are quite peaceful, and they spend their days hunting amongst the rocks for any and all little pests, with FW's on their short list of favorite foods. It was very cool to watch one zero in on a FW crawling across my Elegance coral and then carefully pluck it right off without bothering the coral in any way.