Ctenopoma/akf for congo tank

[Lolafish]

I've been lurking on this site for awhile for suggestions but wanted to get some more input. I have a 75gal tank with a Senegal bichir, African butterfly and a pair of kribensis that get along nicely. I want to add ctenopoma and/or african knife fish. Should I get more than one of these fish if they like being in groups? I'm just worried if the bottom will be too crowded if I do

 

[tlindsey]

a pair of kribensis

Welcome aboard ?
Have they ever
spawned?

 

[tlindsey]

I personally had a pair and the female was highly aggressive after the eggs were hatched. She killed the male.

 

[Lolafish]

Thank you! They actually have a group of fry rn! We sectioned off a part of the tank for them to see if we can grow some out. That's crazy about your female though, the two I have are always together.