I bought a silver arowana about 4 days ago,,, he hasent ate scence i got him and hes lookin real weak and cant really keep his balenice,, ive checked the temp of water and its at idiel for arowana,, and did water test two time and comes out fine.. ive bout all kinds of food from frozen to dried, even live,, but wont eat anything, any ideas or suggetions for appitite enhancer or any thing for him??? Thankz