I have a Synodontis lucipinnis (aged 5 ½) that was housed with a Kribensis Cichlid in a 29 gallon. Unfortunately, the Krib passed away at 6 years old. Is my Synodontis okay by him/herself? If not, what tank mates do you suggest? I'm looking a solitary fish because I am not interested in breeding right now. My Synodontis has been housed with a gourami in the past and they got along great.