Green Killing Machine Mini 3W — Internal UV Sterilizer 20 Gal Fresh & Saltwater - Aqua-Fit

The Green Killing Machine (GKM) Mini 3W by Aqua-Fit by AA Aquarium is a submersible internal UV-C sterilizer designed for freshwater and saltwater aquariums up to 20 gallons (80 liters). This all-in-one system includes the pump, sealed UV bulb, control unit, and adapter — ready to use in 5 minutes, without tools or external plumbing.

Benefits of the Green Killing Machine Mini

• 254 nm UV-C radiation: eliminates suspended algae, bacteria, yeasts, molds, and pathogens responsible for green and cloudy water
• Helps combat cyanobacteria, dinoflagellates, and fish diseases (ich, velvet)
• Patented sealed UV bulb: water flows in direct contact with the lamp for maximum efficiency
• 12V DC ChildSafe power supply — safe for fish and plants
• Indicator LED on the control unit signals when to replace the bulb
• UL, cUL, and CE certified — the only internal UV sterilizer certified by Underwriters Laboratories

Installation and use

The GKM Mini attaches to the inside of the aquarium with suction cups and can be easily hidden behind decorations or plants. The integrated slow-flow pump maximizes the water's contact time with the UV-C lamp. For optimal results, operate 24/7 for the first 2 weeks, then connect to a timer (8 hours per day) to extend the bulb's lifespan. Do not use simultaneously with medications — UV neutralizes chemical treatments.

Technical specifications

• UV-C power: 3 watts at 254 nm
• Power supply: 12V DC
• Capacity: aquariums up to 20 gallons (80 liters)
• Compatibility: freshwater and saltwater
• Bulb lifespan: 6 to 9 months (continuous use)
• Included: submersible pump, sealed UV bulb, control unit, DC adapter, filter sponge, suction cups
• Warranty: 1 year against defects in materials and manufacturing (UV-C bulb excluded)
• UPC barcode: 4897030556265

Available formats — Green Killing Machine

• Mini GKM 3W — aquariums up to 20 gal (80 L)
• Clip-On GKM 3W — clips onto any hang-on-back filter, up to 20 gal (80 L)
• GKM 9W — aquariums up to 50 gal (200 L)
• GKM 24W — aquariums up to 120 gal (450 L)

Why choose this product at ReefSolution

The Green Killing Machine Mini is the most affordable and simplest UV solution to keep your aquarium crystal clear without chemicals. Complement your system with the Green Killing Machine 9W for larger aquariums, a Seachem Purigen for chemical water filtration, or a Seachem Clarity to quickly eliminate residual turbidity.

Frequently Asked Questions

Does the Green Killing Machine work in saltwater for reef aquariums?

Yes, the GKM Mini 3W is compatible with freshwater and saltwater. It helps control cyanobacteria and dinoflagellates in nano-reefs up to 20 gallons without affecting corals or invertebrates.

How long does it take to clear green water with the Green Killing Machine?

Generally, the water starts to clear in 3 to 5 days and becomes crystal clear in 1 to 2 weeks depending on the severity of the algae bloom. Operate 24/7 for the first 2 weeks for optimal results.

When should the GKM Mini's UV bulb be replaced?

The sealed UV bulb lasts 6 to 9 months with continuous use. The indicator LED on the control unit turns off when the bulb needs to be replaced. No tools are required for changing it.