Its not that easy breeding cory's.
They will allmost never breed on their own.
Even cleaning the windows a day before the critters think of spanwing will ruin it
they like a dirty tank (not dirty chemically, dirty as in 'not shiny', with algae and everything)
They need the hot cold cycle. (simulates a dry day/rainy day) plus the water needs to be soft! (not the liquid limestone that comes out of the tap in belgium!)
Then (in most cases) you need at least 4-5 males per female so they can chase her and corner her (like humins ej ;D?)
etc etc
If you'd want to breed them in that tank, you'll certainly be able to, but you'll have to read up on the how to...
But in time you'll certainly be able to breed them if you play your cards right!
EDIT: i just noticed you were probably talking about the raphael catfish... whoops
sry!