When my Mala was approx. 12" I put him in a 180 w/ a breeding pair of downright nasty Red Terrors @ 12" and 8", my Mala went right after them and was pretty much relentless for approx. 30 min. then kinda cooled out however the next morning he owned the tank. The terrors hung at the surface in a far corner. I actually thought it was gonna be the other way around - Terrors would have him in a cave but nope. Back then the Mala wasn't anywhere near as robust as he is now @ 16" - he's like the size and girth of my forearm. I will admit tho -all he really did was chase them - no injuries - but I'm pretty sure if the cichlids tried to lip lock'em they'd be missing thier lower jaws esp. now at his size.