I'm not an expert on corns, but since you got him from Petco I assume it's probably an amelanistic. Corns are really easy to take care of. Low/mid seventies ambient with low/mid eighties warm side worked for me. Care sheet on BPnet recommends 88-90 hotspot, but cornsnakes.com caresheet says 80-85. Take that for what you will. In my experience, they do well anywhere within that range and are not as picky eaters as ball pythons.