My 9-10" Wolf destroyed my 11" Brycon.....sad. Wolf also shredded my 12 year kept Eruptus Hybrid that was twice its size. Currently my 12" Lenticulata Pike keeps it at bay....barely. The wolf will savage her eventually and I am now thinking of starting over with this tank. The Wolf spends all its time in one corner under some plants. The Pike rules the tank but when she approaches the Wolf he attacks. Pike is still much larger but the Wolf is closing the gap quickly and has become quite stout and powerful. Gonna post a thread offering them both up soon.