Originally Posted by SGDude
I was confused by the 2 2213.
I can try the recommended sizes.
Thank you for the advise.
Sorry, I was meaning you could get 2 filters 2213, one for each tank, as this one rated up to 66g is sufficient for a 70g if you intend smallish forest fish; if the tank is intended for large fish, say CA cichlids or a community of rift lake cichlids, I would go with the 2215 then. But it is still the filter rated for the tank so it will work fine.
One must remember than manufacturer's filter recommendations cannot take into account the variety of aquaria out there. Having live plants allows one to use less filtration because the plants are doing most of the work, and as you noted, fish in planted tanks generally prefer less water movement. It all comes with the territory.
I have the Eheim (or Rena) canisters rated to my 70g, 90g and 115g tanks, and I have no issues. I can reduce the flow impact as mentioned previously, and give the fish what they prefer. The heavy planting handles most of the filtration anyway.