I have a 65g which currently has 2 jewels, a red shouldered severum, and a sveni pike. I'm moving the pike and I wanted to get a few more jewels. I believe the 2 I already have are both male, there is some aggression but nothing too much. My LFS only stocks smaller jewels maybe 2.5 - 3", do you think they'd be safe with my 5" jewels?