green-killing-machine-uv-sterilizer For the price, this product seems to be doing a pretty good job on my 90g tank that was overtaken by free-floating algae (aka green water). I bought the 24W model and I went from not being able to see into the tank at all into finally being able to see the back of the tank after about 4 days. It's still a recent purchase for me but I'm pleased with it so far.
Just a 'Thank you' penguin to a water treatment guy :-D. Clean water and sanitiation is a CORNERSTONE of modern civilization that people take for granted and don't think twice about & I felt that way about it before I had fish lol. Thanks to my HS Hi