Hi uk28scots
Snowyangel gave you much excellent advice about your corys.
Your peppered corys, C. paleatus, is one of the most popular corys cats. It was discovered by Charles Darwin in the 1830s. While it originally came from Argentina, most peppered corys are now tank raised.
If you are interested in trying to breed an egg laying fish, this is an excellent one to start with. If you have a pair, once they are mature they will readily spawn.
All corys are schooling fish, so if possible try to pick up a few more to form a school with yours. You will be amazed at how active and playful they will become.
They also like to have some little cave so they can get out of the bright light once in a while. Three rocks with a piece of slate on the top works well, looks natural, and is quite inexpensive.