For $500 there should definitely be enough to get all the necessary things required for a proper setup. Is there an adult he/she can turn to to handle the exchange or refund?
If the OP can't get an exchange (which I honestly don't see why they wouldn't) I have a couple of things I can donate including an on/off thermostat and a UTH. Just DM me the address and let me know what else is needed. I have a couple of things left from my glass tank days.
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