I currently have (in various tanks) Ctenopoma acutirostre, Ctenopoma kingsleyae, Ctenopoma ocellatum, Ctenopoma weeksii (formerly oxyrhynchum), Microctenopoma ansorgii and Microctenopoma fasciolatum. I've also got a few Combtails (Belontia hasselti and Belontia signata), Paradise Fish (Macropodus opercularis), an Asian Climbing Perch (Anabas testudineus) and a number of Gouramis.
Like you, I've found the Bush Fish (Ctenopoma and Microctenopoma) to be (in general) less aggressive than the Combtails. There are, of course, exceptions. Ctenopoma kingsleyae, the largest of the Bush Fish, can be quite aggressive, especially to each other and I've noted that Ctenopoma acutirostre and Ctenopoma ocellatum males don't get along particulary well with each other, probably because of their similarity in shape. I keep the last two mentioned species in different tanks. Because of their diminutive size I keep my Microctenopoma ansorgii in their own heavily planted 10 gallon tank. The Ctenopoma ocellatum, Ctenopoma weeksii and Microctenopoma fasciolatum share an aquarium without any significant squabbling.
All of my Bush Fish seem to enjoy a tank with a heavily-planted area and some driftwood with a cave or two provided by rock structures. I always leave a large open-water area, especially for the Ctenopoma kingsleyae which are active swimmers. Regardless of genus or species I've found the Bush Fish to be hardy, easily cared for fish that will eat any 'meaty' foods including any smaller fish that they can swallow (and their mouths are surprisingly large).
I'm currently trying to acquire some Ctenopoma multispinis and/or Ctenopoma pellegrini to house in a 100 gallon tank with my Ctenopoma kingsleyae. I'm also on the prowl for Sandelia capensis (the OTHER African anabantid genus) but they're much harder to come by than the Bush Fish. The second Sandelia species, S. bainsii is CITES listed and is critically endangered so individuals are not available.
-Joe