The 2011 has pretty much the same flow rate as the Zoomed Canister filter. I tried a used 2011, and was pretty disappointed because I thought the flow rate would be significantly better than Zoomed's
I'd opt for a 2232 if you can afford it. If you have a PetSmart nearby, you can find the lowest price you can on the internet, and see if they'll match it at the store. If you have some bad luck, they might say no, but most employees won't care and just give you the discount.
I have the 2234 on my 20 gallon tank and it rooocks. Maintenance is easy and flow rate is more than respectable
Adding longer hoses to a small pump may not work very well. I know they work from the siphon effect of water falling from the tank, through the inlet hose to provide some of the power to push the water back up hill, but I still would not add more tubing with the goal of putting the little canister farther below the tank than the manufacturer suggests.
If the tubing is long enough already, go for it.
The smaller Eheims would be a good choice, too. I would look at the gallons (or liters) per hour, though, not look at what size tank the filter is rated for.
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