I am having the following situation. I can get a large lipstick tang 4 free,but it's very aggresive in the current tank ( 4ft). I'm having a 1.8m tank,lots of swimming space and place 4 hiding. The fish in my tank currently is a regal tang,(large), indian sailfin tank(med), african clown(large),pygmy angels(bicolour& coral beauty),cardinals and a lionfish(med). Will the fish's behaviour change if i take it,or will it also kill/attack my fish?