New Fluval Fx6 - sloshing and microbubbles - how to fix? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 04-09-2019, 10:42 AM Thread Starter
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New Fluval Fx6 - sloshing and microbubbles - how to fix?

I just setup a 75 gallon freshwater tank on Sunday afternoon. I splurged on a fluval fx6 filter which is now having problems.

It will run fine for about an hour. After that it starts to spit out thousands of microbubbles and I can hear a sloshing sound coming from the cannister. If I turn the filter off and on it fixes itself, only for the bubbles and sloshing to come back again after about an hour.

It seems clear that there is air in the canister, but I have no idea how to fix it. Last night I disconnected the intake and output hoses and reconnected them to make sure they were tight. I did the same with the cannister cover. There is no slack in the hoses. I've read that certain types of media can cause this, but I literally just have the media in there that came with the filter.

Does anyone know how to fix this? Any help would be greatly appreciated. Is it just a matter of waiting a few days for it to settle?

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post #2 of 4 (permalink) Old 04-09-2019, 11:57 PM
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You can try tilting it side to side every direction and see if it spits bubbles and keep doing it till it stops and that should fix it . My canister does that till I get the air out of it .

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post #3 of 4 (permalink) Old 04-10-2019, 01:40 PM Thread Starter
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I think the problem has been solved. Before leaving the house yesterday I filled the tank basically to the top (I had previously left 4 inches of space b/c I will be adding driftwood and rocks). When I came home the filter was working great - no more bubbles. It could be that the leak was at the place where the intake connected with the hose and now that it is under water it is fine. Thanks for the tip!
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post #4 of 4 (permalink) Old 04-10-2019, 08:14 PM
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Yes the rubber connector between the intake piping and hose end MUST be under water otherwise it will suck air.

Glad you got it sorted out!!
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