So, I bought a Fluval 306 second hand (had been used with just fish for about a year previously). I've had it for maybe 5 months or so? It has been fine, but lately it leaks intermittently (with a slow drip down one of the sides by the handle).
I've read about various reasons for leaking, investigated and lubricated the o-ring (which looks to be in perfect shape), and called / emailed the company for advice.
But then I realized that it has also been making a little rattling noise lately. The impeller and well are clean and free of debris. BUT the impeller cover seems to not want to snap in as tight anymore. In fact, now, when I open up the filter after a few days, the impeller cover is sitting there on top of the media boxes (no longer in it's proper place).
The impeller cover looks fine. What doesn't look fine is the white casing of the motor head. It looks a little warped, which is preventing a good seal around the impeller cover.
A new motor head is cost prohibitive and will cost more than I paid for the filter. I feel like it should be under warranty (3 year warranty), but I don't think the company would easily agree with me.
I was thinking, maybe I could try adding some silicone glue around the impeller cover? It is risky though, if it makes things worse. Right now, the filter is still working as it should for the most part.
I've created a "Turtle Stuff" album on Flickr, since Photobucket is no longer any help... I don't think I can get it to imbed though.
https://flic.kr/s/aHsm2CWf3P