if i recall, she has a fairly large tank 100+ gallon. i cant say what to kill off or bring to a lfs, but if it was me, i would keep the cory's. experience has shown me, most cory's can get by with little to no maintenance in a larger tank, and very little food. ill give you a side story as evidence. many years ago, due to work i was working 6 and 7 12hr shifts a week for a year, so pretty much shut down my 120 during that time. thought i had all the fish out. tank got dark and i just topped off the water every couple of months. had the filters off, no air, no nothing. well about 12 months later i cleaned the tank well to get started back up, and found i still had 2 bronze cory's in the tank. sure it wasnt ideal, but doesnt seemed to have hurt them any. 1 of them died last year at 14-15 years old, and the other one which is the same age is still swimming in my tank today. i didnt know the fish were there, so never fed them the whole time. pretty good proof they can get by with minimal care.