I have a 180G tank with 1 8in Oscar, 1 7in Chocolate, 1 4in Severum, 1 5in Grenn Terror, and 5 Silver Dollars. I wanted to add 1 Synodontis Decorus Catfish to this tank, do you think they would bother him or leave him alone because he is a non cichlid and probabley wont try to claim a territory? The cat might be on the smaller side to, maybe 3in at best. This tank has been established for over a year, what do you guys think? Thanks