Yea my 2213 has the basket, I have no experience with the older basketless models. So that could be a factor in the flow. I actually messed around with it today to see what I could get out of it. I have to say, if you guys think they don't have enough flow for a 20.....you guys must be keeping trout? Or have way to much tubing as the pump might not be strong enough to push water very far for a turbulent current. So if the canister is under the tank in a stand and pushing water straight up 3-4 ft, I could see the flow problems. Thus needing a stronger model even though your well underneath the recommended gallon's for the filter. So it really boils down to pump strength rather than the recommended gallon size for the filter.My .02 ............... I had a 2213 on a 15g.
Well, the 2213 is now in the closet as a spare for emergencies and the 2215 is doing well on the 15G.
One thing about the 2213, there is a difference on whether it was modified for no bypass. Meaning whether the media basket is being used or has it been configured like the other classics. I also always use a sponge pre-filter on the intake tube. These two mods would effect the flow but I still stand by the 2215, minimum.
I have an Filstar Xp1 on my 20g and that works well. Only problem with long tanks is dead spots. Trying to work that one out at the moment with a Hydor nano. I find the Filstars have a stronger output than the E. Classics but I still love the Classics for their total NO BY PASS config.
You "would venture"? You haven't used these filters before on different tanks sizes?There seems to be a general thought that "Too Much Is Not Enough", as part of the overall culture, which is why we have Hummers being driven by housewives to buy groceries.
Eheim claims the 2213 is good up to 66 gallons, and some people say it isn't powerful enough for a tank 1/3 that size?
I've got a 55 gallon tank with a single, air-pump driven HydroSponge, and a 75 gallon tank with two of them. I wonder what my flow rate is?
I would venture to guess that a 2213 is at least comparable to the 55.
x 2You "would venture"? You haven't used these filters before on different tanks sizes?
There is a difference between a regular fish tank, and the planted tanks we keep. If you keep plants, you know that you need more filter power per gallon.
I used an Eheim 2215 with no filter baskets on a 10 gallon tank, and even when clean ( and I know how to trim hoses nismo) it was barely adequate to keep detrius off the bottom. The fish weren't fighting the current, but all the water in the tank was moving.
@OP: If you want to deal with low flow from a filter that isn't big enough once your tank grows in, have fun with that. Otherwise I would buy a filter that will give you enough power, and if you deem that it is too much when first set up, then just regulate it with the quick disconnects. I promise that once the filter ages and the tank grows in you'll be happy with a 2217.
x 2 - just about adequate and if you have floating plants - forget it!2215 on my 15 and it struggles.