AA Aquarium Green Killing Machine Clip-On UV System, 3-watt

By AA Aquarium
Rated 4 out of 5 stars
$34.99 (-13%)Chewy Price
$39.99Chewy Price
In Stock
FREE 1-3 day delivery

About This Item


  • Works in both salt and fresh water fish tanks by converting most waterfall-style filters into UV filtration systems.
  • Perfect for getting crystal clear water and removing cloudiness in aquariums up to 20 gallons.
  • Helps create a green-water-free home for your fish!
  • Clip-on design installs in under a minute without any tools and has been UL tested for safety and effectiveness.
  • Sealed housing unit prevents leaks and allows 3-watt bulb to last for up to 9 months of continuous cleaning power.

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Play Video: Learn More About AA Aquarium From Our Team of Experts
Learn More About AA Aquarium From Our Team of Experts

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Questions & Answers

19 Customer Questions

How do you know if the bulb is working or not? The green light on the box is on. Does it turn red when the bulb needs replaced? I guess I expected there to be a noticeable bulb glow....
Answer by ChewyMay 28, 2018
When the LED light is off, it needs replacement.

If it clips onto the filter does it interfere with putting on the aquarium cover?
Answer by ChewyAug 17, 2020
This UV Sterilizer does not interfere with the cover of an aquarium.

Will it affect my live plants in tank? And will it stop the algae growth in tank?
Answer by ChewyJan 25, 2018
The UV will only affect cells that pass by the light. It will kill algae blooms in the water column, but will not affect surface algae nor your live plants.

Is this safe to work on a 20 gallon tank?
Answer by ChewyMar 09, 2021
This system is suitable for up to a 20 gallon tank.

ReviewsWrite a Review

Rated 4 out of 5 stars
68 Ratings
Would recommend to a friend

68 Customer Reviews

Rated 1 out of 5 stars
By Learning on Nov 11, 2023

Don't understand!

I am new at this aquarium thing. I have a green algae bloom. I submitted a few questions to be answered BEFORE I even attempt using this thing. I don't think it clips to my specific filter for one thing, but am waiting for an answer to my questions. And another...does it sit ABOVE the water or in it? I would have to empty my tank some. Please help!

Rated 1 out of 5 stars
By Cristy on Dec 5, 2023

Didn't fit

The filter I was using didn't have enough of a lip for the clip to latch onto. We couldn't use it and have to return the product.

Rated 5 out of 5 stars
By levi on Oct 12, 2023

Quality product

in my 29 gallon tank, this product has almost eliminated my green water problem. It has taken some time. Don't expect the water to be crystal over-night, but it works well.

Rated 5 out of 5 stars
By Daisymae on Aug 11, 2023

UV light for aquiraum

Great product! Had trouble with my water in my aquiraum it was green. Given advise to use the green killing machine UV light. It has done wonders crystal clear water. Better the day one water with no fish in aquiraum yet. I recommend highly

Rated 5 out of 5 stars
By IlliniGirl5 on May 23, 2023

Worked for me

I have a 10 gallon tank that turned a murky green despite regular cleaning and filter changes. When googling the problem I figured out that it was most likely an algae bloom and I needed a UV filter to take care of the problem. They can be so expensive but I took a chance on this one and it has worked like a charm! Easy to clip right on my current filter. Hardest part is being PATIENT and let it work. In less than a week, my tank is clear! Amazing! I agree with some other reviewers that it would be nice to be able to tell definitively that the UV light is on and working. There is a very faint indicator light on a box along the cord and I’m assuming that if it’s off then the UV light has burned out. Not sure so I’ll keep an eye on it long term and will update my review if I figure that out. In the meantime I will do what others have done and put this on a timer to preserve it now that the algae is under control. Bottom line is I’m very pleased with this product.

Rated 5 out of 5 stars