Sadly I can't speak to the Green Killing Machine ones but I had a bloom happen in 2 of my tanks a 29g cube and a 25g bowl. I got this one and it cleaned it up in a few days. I put it in the 180g tank as well and just had it running to be preemptive. The bulb eventualy died but I see now I can just buy a replacement. It is being used right now in the 110g stuffed with some filter fabric stuff from the craft store to filter out the extra floating stuff. https://www.amazon.com/COODIA-Internal-Aquarium-Submersible-Disinfection/dp/B07V26V5MS/ref=sr_1_4
Sonething like this https://www.amazon.com/COODIA-Internal-Aquarium-Submersible-Disinfection/dp/B07V26V5MS/ref=sr_1_6?crid=1J6TZK9RIWV4L&dib=eyJ2IjoiMSJ9.wQFD2UypCoyo4nMA7aeIbKfqbv06Nf2o7l4h83KpHjnnWjlCVe3hPjCa6L3VS9ra0SA9NwKfy6n5LypiZfi7nhXdcPZFcoHY7c7SeeRGxFTIEPnLKy1JOft3yrwbVRMNKi2Bf-RorUa85BDGWihXZMlDdl7aYmqpY4IbStzWRFSd0Ufk3ZB9nF4oC_SbFfV6C5fg5lhmGfcY6ICrmdFKFELaTnW8ZG6YbZi5fq-7b88b2qNac168AguWKtQL5ONc7qD921uhnKjrRkgI-BALdlfrJkH9Y2IVW0cQ2npsdPA.JXoFW4s7GR7j8LqDTVK6spoe-wDtmhqArYZ5yiTWq-c&dib_tag=se&keywords=uv+sterilizer+for+aquarium&qid=1781539427&sprefix=uv+sterili%2Caps%2C273&sr=8-6
