This might be the initial figuring out of the pecking order but I'd not count on it.
We kept common walking catfish as well, had 6 juvies in a 55 gal and two of them were killing the other 4 but were nice with each other, perhaps a couple, even though they were only 6"-8". We picked them up from a dried up seasonal pond.
We had 11 adults 1.5ft-2ft in a 4500 gal just fine, no problem. https://www.monsterfishkeepers.com/forums/threads/walking-catfish-at-fish-story.704473/#post-7941426
I also had Batrachus, even 7 in this same tank about 40 cm in size. I never had a problem with them, they didn't attack each other at all. Unfortunately, they can not be bought anywhere in our natural variant, only gold, albino and mottled. I sold them all and kept only one in another tank. Instead, I bought Gariepinus, which are the most similar to the natural variety. Unfortunately, they attack each other.This might be the initial figuring out of the pecking order but I'd not count on it.
We kept common walking catfish as well, had 6 juvies in a 55 gal and two of them were killing the other 4 but were nice with each other, perhaps a couple, even though they were only 6"-8". We picked them up from a dried up seasonal pond.
We had 11 adults 1.5ft-2ft in a 4500 gal just fine, no problem. https://www.monsterfishkeepers.com/forums/threads/walking-catfish-at-fish-story.704473/#post-7941426