Hi guys,
this is Heiko Bleher and I really cannot believe some of the suggestions made here for mates of C. acutirostre (Leopard Ctenopoma or whatever common name you want), which comes from very acid, black water - extremely soft.
I collected many and this species lives far inland only, (1000 km from the Sea) and most of the fish here, like Toxotes species (Archer fishes), mono, scates etc. are brackish and marine living species of completely different water parameters - very alkaline, high pH, very hard and mostly clear or turbid habitat with mangroves.
It seems to me you all must learn a lot about fishes and you should consider what fishes want. If they are used to live with certain mates (and in an biotope near to their natural habitat).
Butterfly (Pantodon buchholzi) is the only correct mate I have seen on this thread. Some habitat of the C. acutirostre you can see on my website under Bleher's Biotopes. Also mates could be Gnathonemus petersii, Synodontis species (pleurops, ornatipinnis, nigriventris, etc.), Distichodus species (lussoso, sexfasciatus, etc.), Hemichromis species, Polypterus species, etc.
Think fish, that is what I always say and if you do, you have a fantastic aquarium and your fishes will thank it to you and feel so much better and spawn very fast...
with kindest regards from one who should know (after 100 African-field-trips).
Always
Heiko Bleher
www.aquapress-bleher.com