There are several common names for Ctenopoma acutirostre which is probably the most commonly-seen species in this group of fish. Leaf fish and bush fish are two common names. Our member jeaninel has this fish, and contributed to the profile. These fish have very specific requirements, as it notes in the profile.
As for the Pantadon buchholzi, I had this fish many years ago, and no, you cannot have any small fish or those that approach the surface; this is an avid predator. In a biotope-type tank some substrate fish are OK. I had my pair on their own in a 15g (2-foot length) and they lived for years.
Buying any fish in a store that you have not thoroughly researcxhed is a real risk; more times than I care to remember I have had to take fish back, or in some cases destroy them when no other option was available, just because they did not fit in.