Internal Green Water Killer Aquarium Filter Tank U-V Pump

This is a miracle pump. I've had aquariums on and off for the last 30 years and never have I seen this kind of algae bloom. I couldn't get rid of it. It was actually much worse than the "day 1" photo depicts. At the time I took that photo I had removed almost all of the decor due to having to do 50% water changes every 2 days. It was ridiculous. I didn't want to add chemicals that may or may not have harmed the poor fish that were already surrounded by horrible green algae ridden water. I did a lot of research online and this is the pump that was most recommended. After seeing a lot of photo reviews that greatly resembled my very green aquarium, I took a chance on it. I was extremely skeptical that a pump would eliminate the constant green water, but to my surprise it actually worked! I really wanted to do this review because nobody has mentioned using this pump for smaller aquariums. The listing for this particular pump says "for aquariums up to 75 gallons", it doesn't give specifics for small tanks; but I took a chance and tried it anyway as a last resort. My aquarium is a 5 gallon aquarium. They're very common in size and even 5 gallon aquariums can be subjected to the green water conundrum. This pump, even though it doesn't fit in my aquarium upright, it still fits lying down and is fully submerged. On day 1, I couldn't even see my fish unless they were at the front of the aquarium directly under the light. Day 2 wasn't really much different. I didn't think this pump would actually work, but by day three I could not only see the fish but I could also make out the heater on the back wall. My aquarium was clear enough by day 4 that I started moving my other aquarium decor back in. And on day 5 my aquarium was crystal clear. No green water, no traces of green water, and I can see everything in the aquarium including the wallpaper on the back wall. There were no chemicals added. I used this pump in my 5 gallon aquarium for 5 days and my water is more clear than it has been since this aquarium was established and cycled for the very first time. It's like a brand new aquarium and my fish are super happy. I don't know how or why this pump works, but it's pure magic. Having said that, this pump comes fully assembled. It includes oxygen tubing for aeration if you choose to do so. I didn't need the extra aeration so I didn't install that piece. It can be used 4-8 hours a day as the instructions suggest. I personally used this pump for 4 hours during the morning and again for 3-4 hours in the evening to get the results that I did. The results may vary given the size of your aquarium. I plan to leave this pump where it is for now. The instructions say once the water is clear you can reduce the time, so I'll leave it in the aquarium and gradually reduce the amount of time I use it. I did a 30% water change on day 5, AFTER that photo was taken and it was just to clean the gravel and debris from the standard aquarium filter. This green water killer pump is amazing and the results really do speak for themselves. I would have gladly spent twice as much money for the results that I got! It's truly unbelievable!! My fish are happy and their environment is healthy. I'd consider that a win! Highly recommend!!

I recently purchased the COODIA Internal Green Water Killer Aquarium Filter Tank UV Pump (5W, up to 75 gallons) to address a stubborn green water issue in my 50-gallon freshwater aquarium, and the results were phenomenal! This submersible UV sterilizer, featuring a 5-watt UV bulb and a 158 GPH water pump, transformed my cloudy tank into a crystal-clear showcase in exactly 7 days, just as promised. I noticed visible improvements daily: by day 3, the algae-induced haze was noticeably reduced, and by day 7, the water was sparkling clear, letting me fully appreciate my fish and aquascape. My fish seem more vibrant and active, likely benefiting from the cleaner, healthier environment.Installation was a breeze. The unit comes pre-assembled with four strong suction cups that securely attach to the tank’s glass wall, and the adjustable water outlet allowed me to direct the flow to avoid disturbing my fish or plants. I ran it for 6-8 hours daily, as recommended, splitting the time between morning and evening, and didn’t use the optional aeration tubing since my tank’s existing filter provides sufficient oxygen. The compact design (about 10 inches long) fits neatly behind my tank decor, and the ceramic rotator, compatible with both freshwater and saltwater, feels sturdy and built to last. This pump is ideal for my 50-gallon setup, which aligns with its 10-75 gallon capacity range.One minor improvement would be a brighter or more visible UV bulb indicator window, as it’s hard to confirm the bulb is active in normal lighting without unplugging it to check the purple glow, as instructed. This didn’t impact performance, but a clearer indicator would add confidence for first-time users. Overall, the COODIA UV Pump is a must-have for aquarium owners battling green water or algae blooms. It’s affordable, effective, and low-maintenance, saving me from frequent water changes or chemical treatments. I highly recommend it to anyone with a 50-gallon tank (or smaller) looking to restore water clarity and create a thriving aquatic environment.

Had the worst green water because my tank was under a sunlight and I couldn’t move it. Took a while, little patience, but now the water’s crystal. I haven’t had any need to clean it yet. Falls off the side sometimes but it stays out pretty well nonetheless. Runs pretty quiet. Works incredibly. Still running and shockingly cheap for a good filter. I have a 55 gallon tank, and I was worried it was too small, but it worked fine.

This product absolute did the job in about 3 days running for 12hrs during the day. My tank sits in a window and the algae was out of control in my tank. I even had a massive drop in pH that killed half my fish. I needed something to deal with the algae but algicide is really dangerous for fish tanks.This is massive, it takes up the whole tank but it absolutely began to work right away. I ran this during the day and unplugged it at night so I didn’t kill my beneficial bacteria. There’s no timer but it recommends you don’t run it all the time so I guess you just have to buy one or use a smart plug?For the price this worked very well and cleared up the algae within about 4 days. The tank is clear and I’ll probably remove it until I need it again. I wish there was a smaller size but it does the trick.