spotted ctenopoma question

[unfamous30]

How many of these fish can i keep in a 100 gallon tank?

i already have 2 of them with

10 upside down catfish
12 congo tetras
1 african brown knifefish

i am also planning on getting a few african butterfly fish.

so how many more could i have if possible?

 

[unfamous30]

any suggestions???