After 6 years in the jerk tank of 240 gal, the AUSD was upgraded to 1800 gal in the hope that he would behave there. It's been about 3 months in the 1800 gal now and it seems to work. I don't have much time to observe but in whatever little I've seen I have not seen it bother anyone, which is not too surprising as it is extremely selective in who it dislikes.
On the opposite, it lost a few smaller parts, bite size, out of its tail and caudal fins, which means some tank mate dislikes it or the AUSD is "asking for it". Don't know who or how. Also, it couldn't occupy the coveted spot under the pipes as this belongs to the alpha Synodontis eupterus, the "African USD catfish"
which the leucophasis couldn't dethrone. IDK how hard it tried, perhaps not hard or not at all.
I've noticed it really likes frozen fish in its diet. It still goes for the pellets but relishes the fish. The video includes 5 feedings in the end portion.