its definitely possible... but it is risky.. i do have 4 armatus and had a silver.. they didn't bother the silver... but i took the silver cuz of drop eye... thinking of adding 2 blacks which i already have in a separate tank.. expect injuries but theyr not lethal.. i'm more afraid of the red arowana kiilling the armatus.. armatus are aggressive toward theyr own species...at least thats wat i noticed on mine.. they're house with 2 IT dat and 1 NTT, and 2 pbass... and 8 bichirs of different species.. gl.. 1 year old stock and still rolling...