Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
I would go with Two Eheim 2217's.
This way you have same filter material (foam pads),same part's,and I would buy extra set of media,extra impeller shaft,impeller, and O ring that seals the unit.
Will be well prepared for most issues.
Not sayin the part's mentioned wear easily (they don't) just some comfort and ability to get the filter back online quickly.
I run two of the eheim 2217's on 80 gal planted tank and flow drops off a bit after you fill the canister with media and dirt begins to accumulate.
Is same for all filter's.
My two cents.