Review on TAISHAN 3W Mini UV Sanitizer Submersible Light with Timer - Clean Water Green Clear Waterproof Clean Lamp for Aquariums, Ponds, Swimming Pools, and Indoors by Mike Hernandez

So these are before, during and after shots of my little 10 gallon green aquarium with killer UV light attached to my filter. It worked! The difference in the photo is 3 DAYS and I'm shocked! Why am I only hearing about this? Who would have thought that ultraviolet light that could potentially burn your fish and kill others would work? (And that says it's not good for you either!) Make sure you READ PEOPLE! Don't put it INSIDE your fish or you will end up tracing the fish. It will kill them overnight! The filter works best. It comes with a suction cup, but I didn't use it. It slides right into the filter where I need it! I left it on all the time and it's a little cloudy right now. One more day until things clear up enough and then I'll experiment with the timer to keep it that way. Highly recommended because the water sucks for me in this new city!