Having had a stroke myself back in June, I can see the need to have a low maintenance system, (my right side is still pretty useless).
But to me, Cans are not the answer, because unless you are doing frequent and proper maintanance (regular and frequent cleaning(a pain in the rectum, even without stroking out), they spew nitrate like Mt St Helens on steroids. And the result of elevated nitrate on Herichthys (or most cichlids for that matter) is HITH disease.
My answer ( especially because my tank is on a patio) (as you plam)),.... is to use a planted sump.
A couple bags or bio-media, and the rest of sump is heavily planted, , so other than water changes, my system is almost maintenance free.
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With a Porrett Foam wall, and 3 small bags of biomedia (on the left end above) of the 125 gal sump, the plants do all the work, creating a nitrate free environment.
I also keep a small population of shrimp in the sump, to help police up debris that can clog up the mechanical actio of the Porrett Foam
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With only the Porrett and ceramic media in bags, ammonia and nitrite are nonexistant, and so is nitrate
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And to boot, my 180 gal cichlid tank is a bit too overcrowded at the moment.
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As you can see the cichlid tank is under the patio roof, and the planted sump gets half day sun.
Texas cichlids and the entire Herichthys genus have been some of my favoraites.
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