Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump

I'm giving it 5 stars even though it doesn't fit my tank. I didn't think to make sure it would fit with my tank lid. That's on me. It works well and is pretty quiet, think it's worth the near $30 it cost otherwise. Would recommend if you don't have a lid or if you have a huge opening. If you have a regular lid that comes with your 20 gal tank, this won't fit. I assume since I filled it with water before realizing this, that I can't send it back. Not sure, but my current one is still working (barely), and hopefully will continue to do so until I can get a different one. (I didnt think about it and boiled the pieces to my current one in a lazy attempt at cleaning them and totally warped them and it barely went back togetherand barely pulls water through it now. I knew better and just didn't think about it.)

Okay so... I have a 20 gallon temporarily for my 4 inch turtle. I accidentally bought the smallest of this tetra filter, so I bought the medium sized one in it's place. I had only had the tank filled halfway anyway since my turtle was only 1.5 inches at this point. Mind you I didn't realize how fast they grow, and had no idea that Its recommended to have a filter that can filter 2 to 3x the tank size. So I decided to keep both filters in my tank. One on each side. Even though I still don't reach the recommended filter size, my water now almost filled to the top, stays absolutely clean. Turtles are pretty messy so I still have to do the weekly cleanings and all that extra stuff that apparently those who spend hundreds of dollars on filters still have to do as well. I don't know if this is some kind of luck thing, I don't know if maybe my turtle just isn't that dirty (yea right, I see him)... but I'm actually not looking forward to switching out my filter for the 'recommended' filter size, as these filters work so good. I love them.They are both very quiet. Aside from the sound of the water falling back in.. I mean it sounds like a waterfall. Who doesn't want to hear a waterfall? I love it. This can also be prevented by raising the water level or lowering the filter itself. Basically the closer it is to the water, the quieter it is.Such a simple device, yet so beautifully sufficient.The little one stopped working at one point and I thought... welp there you go! Get what you pay for. But nope! Removed the base, pulled out the magnetic spring propeller and tube, cleaned it out and like magic it started right up as soon as I plugged it back in.Love how easy it is to replace the filters. The filters themselves are great and definitely hold on to some dirtiness.One thing I'll say is there is quite a bit of unused empty space. I now take advantage by adding some extra media, but I must say that these filters work great even without the extra.Love this filter and would recommend above any other filter.

This filter works great. Very good price for a hardworking little filter. The water flow is nice.

I barely could tell they were on except for the water flowing. Very quiet. Great for smaller tanks or to help balance filtration in larger established tanks like i had for my 55 gallon. I had this and a canister filter. I mostly used this to help stir and filter the water columns fully

Quiet operation. Does a great job and you don't even hear it running!

The filter does the job, but it’s nothing amazing. It keeps the water fairly clean, but it’s a little louder than I expected and sometimes gets clogged faster than it should. Setup was pretty easy, and it works fine for a small tank, but I’m not sure it would hold up for anything larger. Just an average filter—okay, not great.

Great filter and I bought two, one for a 5 gal and the other for 10 gal. Yes the flow is a bit harsh for Betta, but I managed to attach sponge bio filter at the whisper's outflow lip, please see pic. I drilled one hole at each corner of the lip and attached the bio filter using thin zip ties. I also managed to get the suction cups onto the back of the whisper. Getting the suction cups was difficult, but using a precision flat head screwdriver and patience, it was easier. With the suction cups I can close the lid flush to the tank. I had the topfin silentpower filter 10 before this whisper, and the whisper cleans it better and the filter cartridges are cheaper. The whisper is not too loud, but louder than other filter I have, the marina slim 10. The marina slim 10 cleans pretty good, but it's a power filter with the reservoir overhang on the back. I like the whisper internal filter more because I can lower the water level in the tank but lowering the filter itself. With the marina hanging over the top edge prevents you from lowering the filter, therefore when the water level gets low, you get more splash which my Betta didn't like. I also used the bio filter sponge on the marina to slow it's output flow with Max inflow setting. Also used a zip tie to attach the sponge on top of the lip instead of below it's lip. Well i just wanted to share how I modded this whisper and other filters. Which one is best depends on the fish? For my Bettas, the modded whisper and modded marina are good with slow flow rate, good clean output, and reasonably priced filter cartridges, the marina doesn't filter as well as the whisper IMO. So I use the marina for 3 gal tanks for my bettas.