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

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$38.72 (-23%) Chewy Price
$49.99 List Price
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About This Item

Details

  • 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.

Instructions

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Questions & Answers

21 Customer Questions

Does this fit the Imagitarium IN-FIL 5 2.5-5 gallon filter?

If it clips onto the filter does it interfere with putting on the aquarium cover?

Answer by Chewy • Aug 17, 2020
This UV Sterilizer does not interfere with the cover of an aquarium.

Ik it says 20 gallons but Could you use this on a 29 gallon tank?

Answer by Chewy • Jan 07, 2021
This sterilizer is only designed for tanks up to 20 gallons, it is not recommended for larger.

Is this safe to work on a 20 gallon tank?

Answer by Chewy • Mar 09, 2021
This system is suitable for up to a 20 gallon tank.
Reviews
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4.0
Rated 4 out of 5 stars
107 Ratings
Terms & Conditions

89 Customer Reviews

Rated 4 out of 5 stars
By Kayla on Jan 11, 2026

Works great but melted

I got one for my home aquarium and for my aquarium in my classroom. The classroom aquarium had a lot of water evaporate over winter break and it ended up melting

I got one for my home aquarium and for my aquarium in my classroom. The classroom aquarium had a lot of water evaporate over winter break and it ended up melting the plastic in my green killing machine since it was running with no water. Unfortunate because it works very well!

Rated 2 out of 5 stars
By porkster89 on Sep 29, 2025

would not align with the chute once clipped on

This is clips onto the filter and the light is suppose to align with the outflow chute so it can be like a spot light shining to the water passing thru the chute

This is clips onto the filter and the light is suppose to align with the outflow chute so it can be like a spot light shining to the water passing thru the chute. The problem I had was it would not align with the chute once clipped on.

Rated 5 out of 5 stars
By Melissa on Aug 2, 2025

Give it time

I have a 20 gallon tank that is unfortunately in front of a window, only place it would fit. It was very quickly taken oven by algae. It got so bad that I couldn't

I have a 20 gallon tank that is unfortunately in front of a window, only place it would fit. It was very quickly taken oven by algae. It got so bad that I couldn't even see in the tank anymore. I tried water changes, wrapping the tank to protect it from the sunlight, and changing the filter frequently. I purchased this filter to give it a try. After 2 weeks, I was disappointed to see no change at all. During that time I was still doing frequent water changes. I was almost ready to give up on this filter. Then all of a sudden the tank started to look clearer. Now it is back to crystal clean water. I am very happy with this product, but just be warned it does take time. So don't give up too soon.

Rated 2 out of 5 stars
By Khaleesi on Nov 25, 2025

Not working well

Not as effective as the previous one (same make & model), algae is not disappearing as quickly

Not as effective as the previous one (same make & model), algae is not disappearing as quickly

Rated 5 out of 5 stars
By turner451 on Aug 3, 2025

Good job

We had an ongoing problem with cloudy water, even after doing weekly 30% changes. Put this in the tank and overnight the water was clear, has stayed clear for several

We had an ongoing problem with cloudy water, even after doing weekly 30% changes. Put this in the tank and overnight the water was clear, has stayed clear for several months with no other effort. Like the fact that it’s low voltage for use in water.

Rated 5 out of 5 stars
By Christina on Apr 10, 2025

It works!

I was really skeptical about this device but decided to give it a try. It has done an *amazing* job of removing the algae from my aquarium. Be sure to use it as

I was really skeptical about this device but decided to give it a try. It has done an *amazing* job of removing the algae from my aquarium. Be sure to use it as directed.

Rated 1 out of 5 stars
By Tiffany on Apr 20, 2025

Does not work on 20gal

I bought this for our 20 gallon tank. We’re on day 4 and absolutely no change in the water clarity.

I bought this for our 20 gallon tank. We’re on day 4 and absolutely no change in the water clarity.

Rated 5 out of 5 stars
By Tina on Jan 13, 2025

Must Have

Our established tank was struggling with serious algae bloom; we started to see a big change at the end of the first day and by the end of the week it was crystal

Our established tank was struggling with serious algae bloom; we started to see a big change at the end of the first day and by the end of the week it was crystal clear. Additionally, our Beta loved the new slower water flow.

Rated 5 out of 5 stars
By Dorothy on Mar 2, 2025

Crystal clear tank

This is the best Green Killing Machine I have ever had. No green water and a crystal clear tank.

This is the best Green Killing Machine I have ever had. No green water and a crystal clear tank.

Rated 5 out of 5 stars
By tara on Feb 17, 2025

Effective!

It cleared my green water within about 48 hours. Very happy :)

It cleared my green water within about 48 hours. Very happy :)