5 Labidocromis
3 Blue Socolophi
3 Saulosi
3 Giant Danios
1 Bushy Nose Pleco
Im sorry to hear that. When they are juvies it seems like they are too young to do anything bad to each other, and then all at once you will get casulaties.
I am betting between the Saulosi and the scolofi that the scolofi is the aggressor.
They are from the group Psudochromis, and they are competing right now. When you stock
mbuna cichlids keeping to the one of each group can help avoid that, and putting one male with 2+ females will also avoid aggession.
When they get wounds that bad, melafix and super high quality water in a q tank is the only hope for them. I had a scolofi that had wounds like that 2 or three times that healed with treatment.
Melafix is a good thing to put in the tank about 3 days out of a month just because for the mbuna, they will have tiny fin nips, etc that we won't see from their fighting.
I would keep a close eye on the rest of the 2 psuedo groups and if any more aggression comes of it pull one of the two groups. Then with the other one get the ratio with one male and the rest female. The danios are in danger as well right now, all the mbuna will take their aggression out on them.