Good for nano tanks or dead spots in larger tanks
588848
This pump is much better than the competition. It is small, low profile, and looks pleasing, especially in a black silicone tank with all black equipment. The flow is not that much, so in my 29 gallon reef tank, it just helps with some dead spots. I do like how it evenly distributes the flow. The pump shakes ever so slightly but remains more quiet than other pumps. I'd recommend not being afraid to get a higher flow model, i thought the 425 model would be too much but with the way these pumps distribute flow, it doesn't beat up fish/corals.
735880
Works great on my 5 gallon Fluval mini tank. Really promotes growth of my aquatic mosses and other plants. My only complaint is the mounting options are limited - can't fit on the small end of the aquarium. A solid performer for a couple years.
1627110
Product works great on my 8 gallon nano, but I wouldn't put it on anything larger.  Also, what they don't tell you is that it is loud.  My tank was silent until I installed this, now it sounds like I have a grand father clock ticking away in my room.
1096929
This thing is a beast!  Having a large surface area for filter media is a good thing. I say this is good upto a 100-150 gallon fish tank that is modestly stocked. Keeps my water clean and clear, the fish loves it and I don't really have to maintain it as often as the other filters. More time to enjoy and less time cleaning.
4893095
Works great when u clean a dirty tank and the nitrates are high.  Drops the nitrates quickly without shocking the fish
549334
Great for large aquarium gravel.  Makes easy work of working the gravel and plants in a fish tank.  My tank bottom is 48 x 24 and difficult to manage, these tools are FDA safe and sculpting the bottom much easier.
2613650
I originally bought this for a 40g display tank ... once I had it in place, decided it was a little unsightly.  also, the air pump needed for a 40g made too much bubble noise when running thru this filter.

so, instead, I am using it in a smaller, 10g tank and with a smaller pump, made for 10g filters ... now, it is virtually silent, and because the 10g is not a display tank, the size doesn't matter as much.  the tank is quite clear, and the filter seems to be doing it's job.

I would buy another for a similar need
3938028
Recently upgraded from low-tech to high-tech with my nano Fluval Edge. This is a great choice for any budding aquarists out there interested in the art of aquascaping. It's a much more affordable set up for smaller tanks, and that's a huge plus considering how cost-prohibitive larger CO2 tanks can be.

No hassles when it comes to finding space for it around your tank! However, I don't recommend it for any tank sizes other than nano (under 20g) simply because the CO2 supply won't last a very long time in a larger setup (limitation of the paintball canister sizes).
2281628
I bought this to use on a ten gallon tank, it has now been running for two weeks and I love it. This isn't a professional grade skimmer and the adjustments are minimal but it isn't cheaply made and it is easy to start up. Recommend for a beginner or someone with a nano system
88975
It's good for for a basic light, it fits well on my 20 gal long. Plenty of space for filter and also has extra cut out area in case you have an extremely huge filter. I'm actually using a larger filter than what is recommended for a 20 gal and I still didn't have to use the cut out part. The blue night light is nice as well. My main complaint is that it shines mostly in the middle of the aquarium so the edges are darker. Not for use with live plants.
1255616
so far, so good. I have an established 20gallon long planted aquarium with tetras. this fit nicely behind the tank, we hung it to save floor space on the dresser my tank is on. pretty easy set up, although it was missing part N (one of the plastic elbows to connect to the output spray bar). We jerry-rigged that by cutting a length of the larger hose to attach to the spray bar and output connection. I put in my old ceramic rings/bio balls from the old HOB filter I was running (an aqua clear) and voila!

Note: you should ditch the carbon filter pad, just use the sponge and floss stuff and Purigen for crystal clear water quality!
1381049
Not bad, pretty efficient when you replace the pad the it comes with, with filter floss. I have a 7.5 gallon planted cube and this thing is a lot bigger than I thought. Takes up a lot of space in the back corner of my tank. But I don't plan on leaving this in the tank all the time. I'm only going to use it when start to see a light film on the water surface. It's not asthetically pleasing, but that's just personal preference. Overall, it's a good affordable product that does what it's supposed to do. I wouldn't use it for anything bigger than a 15 gallon tank though.

Pros:
- works as intended
- quiet
- clear housing, so you can see what has accumulated inside without having to take it apart.
- easy setup and maintenance
- adjustable flow rate

Cons:
- filter pad needs to be replaced (not a deal breaker)
- not asthetically pleasing in nano planted tank
- the wire is a little short
- the plastic material doesn't feel as durable as other brands, so I would handle with care during maintenance. But only time will tell if can hold up.
516798
This filter does an amazing job of cleaning a tank. My nitrates are at about 5 ppm.  Water is clear.  Very versatile, offers a lot of media, great flow which is adjustable.  I only gave it a 4 because I feel it is a bit over engineered.  You have to know what you are doing to put it together, and be pretty careful about assembling it.  Filter material clogs rapidly, which some may think of as a con, but it means the filter is doing its job.  Luckily the media is not expensive at all.
3143626
This is a very good deal for decent activated carbon.  I'm not using it much, as my freshwater tank is tiny.
3547330
I use these in my 5 gallon betta tanks. For longer finned fish, I do have to turn it down and point the flow nozzle downward as, even on the lowest setting, they produce too much current for the larger double-delta half moon boys I've got, but it's easy enough to point the filter down.

I don't bother with the sponge, and instead fill the compartment with ceramic filter media for a better bacterial growth colony.
I also don't bother with the little aeration tube, the hose kinks too easily if it can't go 100% straight up and through the tank lid and isn't really necessary.

Aside from that, they're quite, the suction cups work well, and I've had a couple of these filters that have been running steadily for almost 10 years now.
205891
very happy with the air output for two nano tanks, 2.5G and a 1G. perfect water circulation for my UG sponge biofilters
3075528
works really well as a polishing filter and I guess would work fine as a main filter in a smaller tank than its rated for. I have it in a 55 gallon tank and clears it up really well after a water change etc. the downside is that it does take up some real estate in the tank (would not be as important in a larger tank but still takes up room) and is an eye sore. Its not worthing taking it in and out so just leave it in.
I have it hidden as best I can with plants.

it does provide mechanical and biological filtration, better at mechanical though..