I've got a 7" bgk now, with an oscar, some plecos, some loaches, an acara and a silver aro. There is a knife at the lfs, a trade in, and he's a dark brownish color, with no spots. He does have the little flaggy dorsal fin that a clown knife has, but his head is not as pointed as a CK. Is this an african knife? How big will he get? Anyone see any obvious incompatibilities with the other fish in my tank? The tank is a 200gal, and all the occupants are still growing out. I plan to add a tank soon, so if someone needs moving in a month, it won't be a problem. I'd rather not put a fish in there that will cause immediate chaos though.