I must admit, that when i saw this little fella i was kind of like, “Are you kidding me”? I didnt think that a 9 watt UV could work as well as it does. Imagine i have this UV sterilizer working on one of my 55 gallon breeder tanks in my greenhouse. The natural sunlight was blooming my algae like crazy. It was so green that i couldn’t see the fish anymore. Although the fact is, if your tank is growing green suspended algae you have a healthy tank. But, if you breeding Tilapia or any other kind of fish you want be able to see whats going on in your tank. Note: I have another tank that sits back to back with my 55 gal tank , except its a 75 gallon. I have 4 good size tialpias in it. One male and 3 female. I don’t even bother to feed them because they cant even see the food. So they just gill filter feed on the green algae and they are healthy as you wouldn’t imagine. I will be getting another Green Killing Machine, but i will have to get the larger size UV sterilizer for this 75 gallon tank. The point is… this little guy does the job. You will need to replace the bulb about once every 6 months to keep the effectiveness of the UV. Easy to buy. I give this little guy a ………………………..4 4 STARS Green Killing Machine Internal 9 Watt UV Sterilizer with Power Head
Green Killing Machine Spare Bulb UV9W
If you want to maintain the effectiveness of your UV sterilizer you will want to replace the bulb every 6 months. The bulb will still be lit, but if you begin to see the algae beginning to grow in your tank, then your UV bulb has begun to lose its effectiveness.
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Deep Blue In Tank Sterilizer With Pump 35Watt
This is a great deal on a 35 watt UV sterilizer. Works the same way the Green Killing Machine does but with a larger UV bulb, which means clearer water. Here are some of the specs on this filter.
Submersible UV sterilizer eliminates harmful free floating micro organisms pathogens and algae. Small footprint &
compact design. Can be mounted either vertically or horizontally. Long-lasting high
Built in light amplifying reflector for increased output and performance. Epoxy sealed lamp assembly protects against moisture allow direct unfiltered contact with UV tube. Optimized circulation pump included.