What do you feed yours?
I do keep fish, although not plecos and corys, but a really, really common mistake people make is to underestimate the size a pleco will get and cramp it in too small of a tank. This is totally unrelated to your original question, I know, but what variety of pleco do you keep, and how large of a tank? Some types can get 12"+, and may need a fifty gallon tank or larger.
Apologies if that’s unneeded info, but so many people seem to be misinformed about these fish that I figured it was worth asking.
That said, the only thing I know about plecos is that 1) Some types can get very large, and 2) You need to keep some driftwood in with them to suck on. I know absolutely nothing about corys, feeding or otherwise, besides that they’re happier in groups of three or more (some people say six or more if you have the space for it).
Er, sorry if this post was next door to halfwitted…
I have some killies at work and was given a couple of plecos without notice. They are five inches long at the moment. Each is in a ten with a filter running.
Innes says they can get 10", but I’ve heard 18" so I would really like to place them with someone. There is such a thing as responsibility, so I may be buying a fifty for them. Maybe a tub on the floor? 
We have a very small cory and it eats algae tablets once a week and occasionally the inside of some blanched peas. The rest of the time it patrols the tank along with our other algae eater.
I have a pleco in a 29-g tank. I’ve had cories in the past, too, although not currently.
Typically I would feed mostly flake food, and let the cories pick up what fell to the bottom (they would also swim up higher in the tank to eat if they were hungry). A couple of times a week I would drop some algae wafers in for the pleco and the other plant-eaters. I never have had any actual driftwood - I wonder if that adversely affects the pleco? He seems to be doing fine.
When I was young, I had a fish tank and all the requisite fishes. When I got tired of it, the only surviving fish was the plecostomus and tilapia. After I moved the tank to the back yard, this fishes seemed to live forever, although I stopped feeding them. I speculated it was because they ate the plants that had overgrown the tank. Whe I decided the finally dump the tank(and give the fish if they were alive to my nephew), they were still in there alive, big and thriving. Evidently a rat had fell in and drowned and provided them with as much norishment. It was eeerie to see the half-eaten corpse.
My Bad!! :eek: