SainSmart XpertMatic Aquarium Clean Light, 5W Submersible Light with Timer, Waterproof Clean Lamp Aquarium Water Clean Green Clear for Fish Tank, Pond, Swimming Pool

Works great. Keeps the tank clean even with the tank light on. It's compact so it fits well in my 2 gallon tank without crowding the fish. Wish I would have discovered this earlier.

Arrived fast, and easy to use. It has cleared up our aquarium within 3 days, running it 24 hours. We have now turned it down to 6 hours a day. Very pleased.

This UV light made my 20 gallon tank crystal clear in a matter of days. I also like how small it is. I highly recommend it.

DO NOT BUY FROM THIS COMPANY. BEEN ONLINE OVER AN HOUR FOR REPLACEMENT BULB....NO WAY TO REACH THEM OTHER THAN EMAIL.....JUNK JUNK JUNK

Two photos taken 5 days apart. I just changed the thing from being on 24 hours to 12 hours because it worked being on 24 hours and moving to more like maintenance rather than emergency cleaning. I had changed the water two weeks before and it was green again within days. Got this, and it's clearing up.I don't understand why every manufacturer of aquarium filters feel compelled to make the filter an ugly black eyesore. This one is no exception. I got this one because it was the smallest ugly one I could find. We set up aquariums to be something beautiful in our homes. Filters should be either decorative or inconspicuous. This is neither.5 stars for it doing the job. Minus a star for looks.

I've been keeping fish on and off for decades. Recently, I had an issue in my fully cycled 29 gallon tank that has been operating without issue for a full year. The water suddenly turned murky, then green. Research pointed me to a UV sterilizer, and I bought this one.The manufacturer says "not recommended for 24 hour use", so at first I ran it for 6 hours - not much of a change - bumped it up to 12, again, little (but some) improvement. I finally bit the bullet and set it for a continuous 24 hour run. In 5 days, the water was pristine, easily the clearest it is ever been.I believed the recommendation to avoid 24 hours is due to the bulb life - this little baby will burn out quickly at that rate, probably within 6 months. I plan to try a 12 hour cycle, and if the water stays clear, maybe bring it down to 6 hours. But one thing is for sure - this has become a permanent fixture in my aquarium setup, now that I've learned all it can do. And, I'll be buying one for my quarantine tank, since it's a great way to clear ich and other disease causing bacteria.At this price point, I have no issue replacing the unit every 6 months, and I love the fact that the bulb is shielded, meaning no fried inverts or fish.Happy as a clam! (or should I say snail or shrimp...)

It's small enough to work in a nano tank. It cleared my 2.5 gallon green water tank in two days and it took three to clear my 4 gallon cube. PERFECT for a nano aquarium

I like this aquarium UV light because 1) it's very small compared to other devises; and 2) the light is totally covered so there is no chance of it hurting my eyes or interfering with the fish's sleep cycle. The timer is a real bonus, works great.