Better than me, I assign sex to my monomorphic species as I see fit. I'm jealous of the snakeheads you get to keep, you certainly seem to appreciate fish with personality. I put a lot of consideration into picking up a fahaka but my current second largest tank is a 75, and Lord knows a fahaka won't go anywhere near my rays. Fortunately rays are a strong personality fish so I don't feel like I'm missing out. Hopefully I could build a 240 or similar around a fahaka with some community members, but I realize that would be a luxury and I wouldn't chance a prized possession. Keep your head up and hopefully you can give us a vid that makes us cringe at the thought of tank maintenance.