Got a 12" clown knife and a 14" common pleco(huge in girth) and put them in there. she wasnt havin it. She suddenly turned very aggressive.
i removed the 3 5" bichirs, the 6" pleco, and the 7" bgk right before i put the bigger fish in. she didnt show any aggression towards the tiny fish, but she hated these big fish. i even completely re-arranged the tank (new decorations) when i put them in there too.
She was being light at first, but she got more and more aggresive to where she was thrashing them. i had to return them to the petstore, made for a fun day. it was miserable...ugh
so i guess shes goin to be in the 75g for life. by herself.