I have a BN in with my Gourami and my cories. Yes it is aggressive and it will sometimes (when I feed bottom food) it will try to latch on to the other fish, however after a few attempts at this my other fish figured it out and are now quite fast at getting away. They do not avoid the BN at all but if the BN turns towards them then they swim away fast. All of them are able to get away easily and I don't feel that anyone is stressed.
And the BN and the Lionheads water needs are different, so I would change housing.
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