I've had my Fluval FX5 since summer of 2008 and have been running it non-stop since then on a 125 gallon freshwater aquarium. In 2009 I added a Coralife Turbo-Twist UV Sterilizer (36 W) and my water has been absolutely crystal clear for months at a time (I highly recommend this addition). The few times I've noticed it get a little murky (when the curtain was open and sunlight enhanced algae growth) it was totally clear within 12 hours.
The Fluval FX5 is a great filter but requires regular cleaning (every 1-3 months full filter clean). However, you don't need to replace all of the media each time you clean the filter (which can get really expensive). Instead, you can use a garden hose or similar very strong spray to clean the main filter sponges (around the edges of the filter) and the blue filter pads. The white polishing pad should be replaced regularly. I rinse the bio media in tank water and dechlorinated fresh water to get rid of any chunks of things.
As others have said, expect a tiny bit of water when you close the valves and remove the hoses to move the filter, which makes sense since there's about 2" between the valve shut off and the filter. I keep a towel wrapped around when I remove the hose and have never had an issue with getting my hardwood floors wet.
The filter, when full of media and water is heavy but not too bad. It weighs around 40-50 lbs like that (depending on your media).
I suggest having tube cleaning brushes on hand to clean out the intake and output tubes (the ones in the filter no need to remove the filter tubes from the filter to the aquarium). Otherwise a sponge will clean the inside of the filter perfectly and a strong spray will clean everything else.
When it's running it is incredibly quiet. And as others have said, it's good to note that when you first turn it on it will run for 2 minutes then shut off for 2 minutes then will run for about 24 hours then shut off for two minutes and turn back on. It will do that every 24 hours to remove air in the system.
A few things to note:
This filter has incredible suction, it's made for a 400 gallon tank. Don't place plants or bubble makers anywhere near it or it will suck the plants against and in and the bubbles up (that will make your filter noisy).
If you are breeding anything in your tank, expect to find babies in the filter. I find Corydora catfish in the filter all the time. They're alive and fine, but need to be moved to the main tank rather quickly so clean the filter every month. Thin skinny fish like loaches may be sucked up into the filter if they can't swim fast enough so you may want to put a breeding basket around it to keep them away but not hinder the filter intake.
The media is expensive, but you can make your own rough filter pads (open hole filled black filter media), and carbon bags much cheaper than buying the premade media. However, the rest you'll want to buy real Fluval parts (search for best prices).
Remember to fill it until it's about 1-1.5" from the top before attaching to to the hoses. You don't want the filter to have to work too hard to finish filling. It is self priming but needs that much help to make it work effectively.
If you hear it struggling after you hook it up (and you added enough water) it's because there's too much air in the system, turn it off, wait about 15 seconds, turn it back on. You'll see a huge mass of bubbles come out then it will work fine.
Remember to open the valves once you have it hooked up to the hoses before plugging it in. Yes I've plugged it in and forgotten to open the valves.
Overall I highly recommend this filter for any tanks 100 gallons and greater.
I've been running the FX5 on a 125 gallon turtle setup for about two months now. Setup is very easy, especially if you have previous experience with canister filters. I saw another review that stated that the filter was noisy, but mine is pretty quiet even when the tank stand's door is open and the filter is exposed to the room. My flowrate has been relatively high, especially considering that it is packed with biomax and polishing pads. It is important to note that unlike other Fluval canisters, this beast actually filters water from top down, so you'll want your finer media like polishing pads in the bottom basket.
I docked a star because I am not a big fan of the design of the internal media baskets, nor do I like the cheap plastic 'T' rods that are used to pull them out. Also, despite the stop valves on the intake and outtake hoses, be ready to clean-up water when detaching for routine cleaning.
Although the Eheim Professional Canister Filters are arguably better for certain purposes, you aren't going to beat the value of the Fluval FX5. The features and specs you get are equivalent to several much more expensive filter options.
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I got one of these from my local F/S, and it works great. It is very large though, which to me is a good thing. More Water volume which is always a plus with saltwater aquariums. It comes with a DVD that tells you how to set it up. You don't really need the DVD, because it is quite simple to set up and get started. It comes with more than enough hose to do the job. I have the hose coiled around in the bottom of my stand it is so long. Every night it shuts off to let the air bubbles escape and then turn back on. You don't have to do anything to start it. So far their have been no leaks or mechanical failures.
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I'll keep it short and to the facts.
The FX5 does everything it is advertised to and is very quiet. I am using it on an 85 gallon freshwater tank stocked with 7 3-4 inch African Cichlids, 10 2 inch clown loaches, 10 tiny convicts, one 6 inch plecostomus, and 2 one inch rays. I only add aquarium salt to the tank and treat the tap water with Aquasafe during 25% water changes once a week; no other chemicals. After running the FX5 for 3 days I tested the water for ammonia (0 ppm), ph (7.5), nitrite (.5 ppm), and nitrate (40 ppm); all within tolerances for an established community tank, albeit a little low for the cichlids.
My conclusion? The FX5 rocks and is well worth the money.
My long journey to this conclusion (in short form)-
I read all of the reviews and ordered an Eheim Pro 3 2180 a couple of months ago. Sent it back immediately because I use salt in the water and that would destroy the internal water heater and subsequently the pump (according to the Eheim technician).
I then ordered an Eheim Pro 3e 2076; it came, it leaked profusely at the pump-to-canister seal (made an incredible mess), tried all of the solutions mentioned in the troubleshooting section of the documentation, called the tech line to no avail, returned the pump for full refund.
I then ordered an Eheim Pro 3e 2078; it came, it leaked profusely at the pump-to-canister seal also, became disgusted at the product quality, returned the unit for a full refund.
I then ordered the Fluval FX5; it came, it worked as stated, I'm very happy!
Hope this helps.
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I really like this pump. It keeps the water in my 150g crystal clear and my fish happy. Recently though I have been having problems with it. Every couple of days the pump quits working. I have to then take the pump off the unit and pull it apart to see what the issue is. I haven't found anything obvious but whenever I do that it seems to do the trick. I thought it was the substrate that I use but it wasn't dirty. I'm kind of clueless on this one. I'm going to email fluval and see what they say. I might just have a defective pump. Like I said earlier when this pump works it's awesome so most likely the one you get will work fine. I just thought that i would spread the word.
UPDATE: NOV 16,2011Pump works great. Had too much media in the system and I was blocking the flow of water basically. I would definitely buy this pump for my aquarium. You can't go wrong with this one.
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I bought one through Amazon. Bigger than what I expected. It's a reasonably healthy space for a betta, mine is swimming happily. I was able to fit a small biological filter in the corner with no space problems. The unique "condo" design doubles as hiding areas for the fish. And it looks cool.
