We generally refer to these as the Chinese black boxes and although I haven't used this one exactly I have used two different "brands" galaxy hydro and popular grow. And they both worked great. Had the galaxy hydro for around a year until I upgraded to the popular grow ( because it has wifi and a phone app, around $130 on eBay). If you decide to go with these I would go with two for a 55G. I was using one on a 40B and the edges were a bit dim compared to the center.