I purchased a 4" silver arowana yesterday and was worried because after acclimating and all that good stuff I put him in my 150 with a couple of bass's and 3 Dats Its been in a corner not moving,,I Fed Krill this morning and it was not interested at all... none of my guys are Picking on it? I wonder if this is normal? should I be worried..I mean I wanted one but I didnt want to spend alot just because it would be my first arow! so to spend on a black or Australian would not be logical for me..