120 Gallon Tank FX4 losing suction/flow? Cleaned Unit and Impeller + Well - am I missing something?

FishGirl38

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Hi All,
My FX4 on my 135G tank isn't running like it used to. This filter (and tank itself) is less than 2 years old.
I noticed today while doing a water change - that I lost flow from my filter at about 20% the way down.

*I do normally leave the canister running during water changes - a mistake?* [If I'm doing a large w/e, I'll bring the water as low as my filter will allow and then re-fill - could this be causing detrimental stress on the motor?]

Its a big tank, I've been losing fish here and there recently, I decided to do a filter cleaning as well.
The filter def. needed cleaned - I thought that would solve it - No Change.
Took the whole thing back down again, cleaned the impeller and the motor well (that also needed cleaned) - No Change.

I've shaken the hosing between the tank and the filter - I don't keep snails/the snails I do keep are nerites and they're too big to fit into the intake or outake. I do have live plants - but are very sparse with longer leaves - it'd take a lot of plant debri to clog i'd think, and there isn't that much in my tank - maybe it's in the filter hose (....)?
There isn't any slack - the hosing is as taunt as it can be..

I didn't see any scratches or deformities with the impeller - but there was a darker...band around the whole center - I'm assuming this is natural and normal though.
She primes just fine. When it comes to pushing water though - I feel a slight trickle on my finger...
This filter used to throw water 4 feet into my tank. Any Ideas?

I - ironically - bought an aquaclear 110 that I had planned on adding to this tank as supplementary filtration alongside the FX4 - turns out, for right now, it's a 'replacement' until I can figure out what's going on with the FX - but - My fish have a filter for now - just gotta figure out the FX. Any help is appreciated.
 

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Try unplugging then wait a few seconds and plug it back. If filter isn't clogged you may have put to much wear on pump.
 

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At this point I think I'd take the inlet and outlet hoses off an give them a good blast through, with the corrugated hose its so easy for for algae growth which in turn can start to pick up particles slowing the flow
My fx4 hoses are not tought and have a hight of 3ft from the top of the filter
 
Have you checked that you haven't accidently turned out- or intake red "adjustments" so they are nearly close? The red ones near filter itself?
 
You could always try to run it without the media to rule that out, i probably wouldn’t do a wc with the filter running if you’re changing more than a 25% of the water, it could potentially cause air to get in the filter and cause problems.
 

Random Great Topic!

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