i have both my fish in a 65 gallon tank my tiger oscar is 5in an my jack is 3in big.i had my oscar in there first for a week then i added my 3in jack.My jack at first started to hide from my oscar and after a day when i woke up i saw my oscar being normal and my jack was breathing very heavy. i don't know wants go in on and all today he is just staying in the same spot, he isn't really eating i put flakes for him but he doesn't eat it and then after i while my oscar comes and eats it. Is my jack going to be ok or is this normal for his first week or so