hi i bought an 04 royal over a month ago ,i tried feeding him after a week but no luck,i left it another two weeks,still no luck,how will i know when he is hungry,he does cruise the tank but as above hasnt fed,temps hot end 94,cold end 84,what size prey should i feed him,i was told by the previous owner that he was on one medium rat weekly,but i suspect he may have been overfed,any advice will be appreciated.