Hi. Just started my aquarium 6 days ago and stocked it with 3 of each shark kinds namely Bala, Redtail, Rainbow Albino, Silver Apollo. I also bought 3 red and blue lobsters. I bought them all in one day. The first few days, they are all getting along together. But when I bought 3 shrimps the blue lobster started attacking my sharks and the shrimps. The shrimp and blue lob would fight all the time. Last night I noticed one of the Silver Apollo has its tail torn and bleeding. This morning when I feed them, the Silver Apollo totally lost its tail. What should I do? I am very worried with my silver apollo that I may find it floating when I get back home from work. Why is the blue lob suddenly attacking the fishes?