My ~16inch silver arowana is in a 135 gallon tank with a ~7 inch pike cichlid. Recently, he has stopped eating (this has been the case for about a month maybe). Before that I fed him thawed shrimp and floating cichlid sticks, along with the occasional earthworm, all of which he ate with gusto. Then he stopped eating the shrimp, followed by refusing earthworms and would only eat sticks. I tried feeding him some other foods but he would not eat anything else. Eventually, in the last month or so he has stopped eating sticks consistently, just eating them every now and then, and only 1 or 2 at a time. Just wondering what I can do to reverse this trend. I know that they will often go on hunger strikes but this is why I waited for a month before asking about it. Thanks for your help.