I have a 75 gallon tank. current inhabitants are 1 six line wrasse, 1 coral beauty, 1 emerald crab, 1 skunk/cleaner shrimp, 1 blood red shrimp. The six line has never bothered either the skunk or blood shrimp. About a month ago I added two peppermint shrimp. They recently disappeared. So I went out and bought two more. The wrasse immediately attacked and killed both of them. Is this normal behavior for a six line wrasse?