Well, i have quite a review on this product. I recently purchased the 1-3 gallon pump, and boy was i not pleased when i opened it. It was really tiny, it had a new design where it clips on to the side of the tank rather than suction cup to it, and the clip wasn't even big enough to go over an inch, they should have stuck with the suctions cups. The little lid that covers the filter, kept falling off and wouldn't stay on, so i ended up taking it off. Now the quality of the pump, i didn't find that it cleaned very well, i would watch things float right by it, and it wouldn't suck it up. I ended up taking it out of my tank and going back and buying the next one up for a $ more. I definitely would recommend getting the 5-10 gal one, its a way better design and works amazing!