I really really wanted a ghost knife, I bought him about 2 weeks ago, about 4" long very healthy. I put him in with my SA's and arro thinking hed have enough hiding places. Guess I was wrong... I hadnt seen him since i put him in and it was time to do some maintenance. I pretty much turned over every rock and did a 50% water change... He was no where to be found. Definatley starved or eaten. His size was relative to the other fish. AI want to try again, I have a african tank and a discus tank but im guessing thats not a good idea. Any suggestions so I can have a better chance of keeping one? I also like the tiger knife. which would be safer or just tell me if both are a bad idea. Thanks!