Thank you for responding, Aokashi & Stven P.
I don't know if I can return the fish, but I will see if anyone I know would like to take the Cory, catfish and plecostomus. Sucks because I like seeing all the fish but I don't want them to be stressed because of overcrowding. Hopefully I will be getting a larger tank soon because I'm really enjoying watching the fish. They're very calming and have such personalities!
My tank is pretty well planted, I think. It has almost a wall of plants that the fish like to hide in and the beta rests on the leaves. I've posted a side picture of my tank on my profile. I eill check out the LFS for ottos.
Thank you again for your feedback. I really appreciate it.