I do t want to lose my buddyGive him time... his appetite will either take off or not. I've experienced a failure to thrive with Oscars before. I call it that because my lfs told me that all but 2 of that batch of Oscars had died... bad genetics or something.
I guess the real question is how long has he been in there? Oscars tend to sulk for a couple of days after a transfer in my experience