Well recently I put both black arowana's together, but i have silver separate, the two blacks seem to get a long for 1-2 days then the bigger one starts to bite the smaller one's tale. so the smaller one always gets beat up. so what i do now is just grab the aggressive one with a net and let her go again after 1 day, but the biting continues after 1-2 days. not sure what else to try now.
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