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product works well as long as you don't use a planted light like i was using..which produced the unwanted algae on real plants and rocks....i had to dismantle the planted light for the green machine to work better and use the light that came with 20 gal high tank...there is also the caribbean plant fertilizer that contributed to excess algae...hope it wears out soon...thank you for your time...slk
Verified purchase: Yes | Condition: New
This little clip on UV light cleared a 20 gallon that water was So gray and cloudy couldn’t see fish. I kept doing a 30% change but over Night back to gray cloudy water. Put the clip on Green Machine on to my amazement over night take Went from cloudy to clear. I was simply amazed. Great price too.
Verified purchase: Yes | Condition: New
It's helpful if your filter water flow opening is over 3 1/2" as that's the size of the clip on light. I have several filters + it doesn't fit any but I clipped it diagonally to make work. Does a decent job on my 20gal tank even tho not all of the water flow runs thru it. It's better than the big one I had which took up a lot of space.
Verified purchase: Yes | Condition: New
I have a small tank with integrated filter and its in light of kitchen bay window. It took almost a week but no algee and our tank is in key spot where we enjoy it.
Verified purchase: Yes | Condition: New
It does a great job for the price. My tank is a 25 gallon so, it struggles to keep up. But, I went from green water to clear so it took care of the algae problem. Moving forward, I'll purchase the larger unit so that it doesn't need to run constantly.
Verified purchase: Yes | Condition: New