I'm thinking you are talking about bristlenose plecos, which are a species of catfish. Planet catfish is a great resource for all catfish information. Here is a link to just one species of bristlenose. There are many of them, so keep that in mind! Below the pictures is infomration you are looking for.
http://www.planetcatfish.com/catelog/loricari/ancistru/49_f.php
Now let's talk about your tank. How many gallons? What other fish are in the tank? Is your tank cycled? Cory cats are usually very easy to keep in a tank which has me concerned there may be some problems with your set up. Let us help you. Welcome to Fishlore, and I hope to hear back from you soon!
