App keeps crashing
I love the LED lights from Fluval but I can’t even use the app because it constantly crashes. The app control was one of the major factors to buying Fluval so with the app unusable this is a real let down. I am not exaggerating when I say the app is unusable. It crashes within 2-3 seconds after opening.
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Connection problems
Every time I try to connect to my 4.0 light it will not connect unless I am in the same room
Wanted to love
Ooof I just got this light and I had read reviews about how finicky this app is but was hoping I’d be one of the lucky ones. Unfortunately I’m struggling with it and still haven’t been able to set up a successful custom schedule. I’m still working on it. Will update if I ever have any success. Really hoping I didn’t just waste all this money 😳
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Worked great
Was able to set a really complicated light schedule in pro mode easily.
Crashes now
Newest update causes app to crash. Can’t control my lights
Update: app is working now.
Update: app is working now.
App crashing
Was good at first. I’m using all 1st gen fluval 3.0 and aquasky 2.0… and it worked beautifully … now when I go to the manual mode, it just crashes. I went back to fluval smart… app is not as polished but at least it works consistently
Update: seems the new updated solved the crashes.
Update: seems the new updated solved the crashes.
Total garbage
I feel like a sucker for paying for this. The newer app was an unneeded, unnecessary change. It crashes constantly and barely ever works. NEVER works on the first try. I hate to say it, but this may be where Fluval and I part ways… at least for their lights. This app is complete garbage.
Different.
Different than what I’m used too. I would prefer a remote of some sort, the Bluetooth on my end took a long time to connect
Horrible Programmers
Crashes constantly
Remote Access is Necessary
This app works fine for me and gives me the control I need over both my Marine 3.0 and Reef 4.0. - while I’m at home. But since it has no internal clock, it doesn’t know what to do when the power returns after an outage. So it really needs to provide remote access. One way to do this is an internal computer. Another would be to make it Möbius or Apex MXM aware. But please do something , because even a momentary outage makes the Fluval lamp a boat anchor.
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Poorly Made
Crashes often, lots of bugs, and many features that were just never thought through but advertised as complete. I might even call this a scam.
Terrible app. Everyone at Hagen should be euthanized.
They will not fix anything, and it’s been years with dozens of glaring bugs. The light will randomly lose connection, switch to Bluetooth instead of wifi, shut off, settings get wiped etc etc etc. there are literally more broken features than functional ones. And to top it off, the light is designed so that when settings are changed/modes are switched, the light goes to max brightness and flashes on and off three times which is….. great for the stress of livestock. Did homo ergaster design the software for this thing? What is going on in Germany?
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Good product, horrible app
Connected once, then failed to connect after a couple of launches. Went through the process of uninstalling and reinstalling only to have it not connect.
If you purchased this product, return it for one with a better app, it’s 2026, come on.
If you purchased this product, return it for one with a better app, it’s 2026, come on.
Unstable Connection
Expensive freaking light for it to not stay connected. Can’t update the app either, trying to set up a 60 gallon with a junk light.
Horrible layout compared to previous app.
Much prefer the other app. But unfortunately, the reef 4.0 requires this app.
Ai 2026 - Fix the App
Ai in 2026 is good enough that you guys could fix the features overnight. What is goin on???? This app does not match the quality of the light. Competition will take over of you don’t fix this thing ASAP, one night of work!
App does not work and now light stopped working
I just bought the reef 4.0 today Mar 9, 2026 got it home worked great really like it then downloaded the app for the ability to create a schedule and the app crashes and won’t config and also shut down my light to the point we can’t turn it on any more just sits and a green power light.
Needs updates
Love the lights but the app almost never gets updated and trying to stay logged in is another problem. Good luck with the app if you do sign in trying to get everything to save and change is another problem.
Where are the features?
I’m baffled by the most expensive light doesn’t get WiFi control. Also your website says you have aquarium maintenance on this app and is advertised, but where is it? Not to mention why do I constantly have to keep logging back in.
I want to love this app, but this app needs lots of work and to not be misled based on advertisements on website. Also can we get an option to not have it in military time as well
I want to love this app, but this app needs lots of work and to not be misled based on advertisements on website. Also can we get an option to not have it in military time as well
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Broken with last update
Thanks for fixing the crash-to-homescreen bug in the last update. The app is now working again. However, I can’t give this thing more than three stars. There are some very questionable UX design choices in this app. Please do better with your QA before you push out updates.
