I have a 2" black ghost knife and it dont look like he is eatting when in my 55 gallon hes not the only one in the tank none of them even bother him he scares the bigger fish actualy I was woundering what a good way to get him to eat is I was planing on putting him in a 20 gallon in till I know he is eatting fine I tried frozen bloodworms and flakes