The black shark (Morulius chrysophekadion) 26" TL has been up to his old tricks again. As you might recall I had mentioned how he had killed a 5' 51/2" arapaima and 3 red tail cats (3 to 4 and a half feet) back in 2003/4 period. Three hobbyists got in the 52K and caught him a year or two later. Since then he was kept in a 225 each winter and put in a 16 x 8 pond each summer.
I really felt sorry for him and thought since I removed all stingrays from the 15K, I thought he would be safe with the smaller fish in this tank since he was now in the 18th year in my care.
He was fine for a few days, except for killing my old 22" TL Dovi (Herichthys dovii -the Wolf cichlid) the first night in the tank. It was unusual because he normally chews for a few days on the skin and protective film on a fish and then they might die from the number of wounds he causes. I think the Dovi just died from a heart attack while fighting the bigger shark.
The Shark I bought as a baby about 2" long from Marine Resources (Sean Wilson) Mississauga Ontario in 1992. The Dovi I bought from Scot Goddard at AA Aquarium on Hamilton Mountain, Ontario in 1996 as a juvenile.