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Sorry to start off with information that may not be welcome.
The good news is that you have solution options that are effective.
In any tank with peacocks and mbuna, it is entirely predicable that the peacocks will be targeted. Rehome the dragon blood.
In a 30G tank with 14 Malawi cichlids it is entirely predictable that there will be aggression.
You need the 72" tank now. Two and three inch Malawi can spawn which means they are mature and capable of their maximum aggression. The length of the tank required is not due to their size, it is due to their aggression.
Depending on which mbuna and which peacocks you may need to rehome other species as well. Which do you prefer?
The #1 most effective action you can take to manage aggression in an all or mostly male tank is to remove females.