Ok,I had a 6 inch oscar and a 6 inch EBJD in a 55 gallon tank for a few months together.They got along great.I had a chance to obtain some ruby red oscars from a LFS.He wanted my EBJD in exchange for the oscars.I said ok.I have a 90 gallon tank with a 4 inch severum and some plecos.I would put the new oscars in the 90 and use it as a grow out tank.So I got the EBJD in a bag and knew that I would have to move the severum as the Oscars are only an inch long.I took the severum and put him in the 55 gallon with the oscar.When I came back home,maybe gone 2 hours,the oscar killed my severum.Really thought the severum would be able to handle himself.I feel so bad.What more can I say.Can't believe I did this.