May I ask why you wouldn't suggest the Tom Rapids mini? I was thinking about buying one for my 12 gal.I would think that if you can control the outflow, then it shouldn't be over-kill. Fill 'er up with ceramic rings and you should be okay. Like, you'll want the surface area that the 2213 can hold, but maybe not the full force of its outflow.
Just don't get the Tom Rapids mini canister, haha.
May I ask why you wouldn't suggest the Tom Rapids mini? I was thinking about buying one for my 12 gal.