Two tanks, 1 filter.

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SpinalFan

Feeder Fish
MFK Member
Apr 29, 2013
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Durham Region, Ontario
Has anyone done this? If no one has, does anyone have the means to?

Part of my "fish room" includes twin stacked 35's. If I put an overflow on the top tank draining to the bottom tank, is there any reason why I couldn't run my fluval 404, with the intake in the bottom tank and the output in the top tank?

Fishkeeping is my cocaine.
 
It's been done before but my concern with be the head height depending how high they are stacked


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Canister instructions say to be placed under tank :/ therefore pumping up hill. I understand there are huge limitations, but again, wondered if anyone has tried it or if anyone has overflows plumbed TO try it for the rest of us.

The reason I ask is to eliminate the needfor sumps and matching return/pump speeds. And cost efficient!

Fishkeeping is my cocaine.
 
You will still have to regulate the flow. I know canisters are made to pump up hill but most have a max head height of 4' or so. Like I said it might work depending how high the stack is.


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It's not uphill, no different than any canister under a tank.

It'll work fine, as long as you realize there will be cross contamination of diseases, so don't use one as a quarantine.


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It will work but you would be better off running an individual filter for each tank. This will prevent cross contamination and if one filter breaks only one of the 2 tanks will be affected.
 
I actually do this occasionally. I made a filter with a repurposed pond pump and cycled two stacked 25s from my 55 with it. Ended up being way more complex than I intended with overflows, floats and check valves but I had all the materials. I have wanted to do and acrylic cascading tank like you sometimes see plants in in stores.

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Your idea is basically the same as using a sump, just using a weak pump to pump uphill and small compartment to hold media. If you have fish that don't mind slight water movement, it should work
Although canisters are made to pump to tank height, that height is maybe 4 or 5 ft, a fairly low head pressure, compared to most pumps used in sumps.
And... using a sump does not require matching flows. I use 3 or more tanks on each sump, and the flow can be lower to one tank and higher in another.
Flow rate from the pump determines the gravity flow to the sump, I like to use 2000gph or higher pumps for multiple tanks. But I keep riverine cichlids that come from moderate, to high flow areas.

 
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