On the Upside Down Catfish, I recommend you read out profile, the info you are looking for is contained there. Profiles are under the second tab from the left in the blue bar across the top of the page, but when a name is shaded in a post you can click on that for the profile. You'll find lots of info in the profiles.
The "eggs" might be cory. If you have five there could well be male/female mixed, the females a plumper (rounder) when viewed from above. You would probably notice spawning activity; one or more males will chase a female, and if she has a fertilized egg she carries it in her ventral fins and deposits it on a surface which can be a plant leaf, wood, tank glass, even filter stems. They will eat the eggs if they come across them, or the fry if they should hatch unless they have wood to hide under.
Cory behaviour is often confusing. They may race up and down the tank walls, sit motionless on a leaf or other surface, suddenly roll over as if they fainted; all of these can sometimes be indicative of water problems, but not always. I have more than 30 cory, 10-12 different species, in my 115g tank and the pandas will race up and down one wall almost every evening, and have done since I've had them (2 years); yet no other species does this.