14% of 56 verified Fluval 407 Canister Filterowners don't recommend it, and 1 describe specific problems — based on real owner comments from Reddit, enthusiast forums, and YouTube.
For balance: 75% recommend it. This page collects the complaints so you know what you're signing up for — read the full owner report for both sides. How we score
“i have a 407, it can be a pain in my ass. cleaning it is such a hassle lol, but i have found everything has to be set PERFECTLY in it or it wont run at 100%”— pxyton- on Reddit
“I do not recommend the Fluval simply due to their aqua-stop valve being poorly made and their clamps that hold the top down are not ideal either.”— SigmaLance on Reddit
“I’ve had a ton of trouble with cloudy water since I switched to two trays of the bio ceramics”— @Zachary360Games on YouTube
“if still no improvement I'm moving on from fluval as my second hand 307 isn't much better”— Ok-Temperature-6559 on Reddit
“At 75g I’m going with an fx4 so much more space and flow rate then the 407.”— Scottish_Aquascape on Reddit
“I’d recommend the FX2 I have it in my 75 and it works phenomenally”— Stonermatt71 on Reddit
“When I ran 4 series they were always a pain to restart.”— SteadyHigh on Reddit
“I will never go back”— @MilosStevanovic1 on YouTube
Not complaints — practical notes from owners that didn't affect the score.
“It's a Fluval 407 Performance Canister Filter we bought it at Pet Smart.”— Limp-Ad8550 on Reddit
“Fluval 407 Performance Canister Filter. Have not added any substrate at the bottom since upgraded to the bigger tank. Only the turtle, filter and her platform.”— ewokzombie on Reddit
“And this is the canister filter I use, I have a 75 gallon tank so depending on your tank size you could get the smaller version https://www.petsmart.com/fish/filters-and-pumps/filters/fluval-407-performance-canister-filter-5290152.html”— pikachusjrbackup on Reddit
“really easy. considering you have a sink or bathtub available. the hoses have a quick release lever so the water cuts off instantly when removing.”— shakenbake74 on Reddit
“I am having this issue currently. Just read your post. I think it’s from having slag in the hose. I have mine filter up on table I built and it makes slag in the hoses . If I hold the filter off and below the table it stops.”— severum87 on Reddit
“Aynısını yaşıyordum. Emiş borusu tıkanmış temizleyince tekrar canavar oldu. Akvaryumda patlayan tds için neler neler yaptım meğer sorun buymuş”— sarper361 on Reddit
“https://preview.redd.it/very4q2chsuf1.png?width=1080&format=png&auto=webp&s=a720405581311211f1266531959a13118e558697 I did a hose swap on this 407”— nderworldaquatics on Reddit
“I have both the FX4 and 407. My personal opinion is that the FX4 works best in 6ft long tanks, unless you need strong water flow. It's very powerful. The 407 is suitable for a tank that size.”— StickyDogJefferson on Reddit