the couple especially the male went crazy upon first introduction,i did not do the usual way of divider first then introduction later method.
i immediately put in the female with him in the same tank.
guess what,no fight but alot alot of fanning and dancing
next few days,the couple body colour got so red like bleeding blood,still as loving and defensive to intruder(human shadow and hand signal),the good thing is confirm safe,zero fighting and zero jaw locking that i worried most