It's been in the tank for a week and a half now... When I first got it it didn't eat for 3 days also but then it started eating after that... I checked the water perameters at the lfs and they said everything is great... I've been feeding him meal worms cuz that's what the lfs was feeding him... I have 2 Tiger Oscars but the leave the Jar alone and they eat pellets... They eat 2x a day... I also have 3 clown loaches and a spotted pim catfish