Originally Posted by ohhaiitslily
Because clearly acting like I don't know anything and am completely incompetent definitely is great advice.
I have not seen any of that in this thread. I have seen people giving you advice that that focuses on keeping your fish safe and healthy.
I suggest you take a break, then come back and re-read the thread to view the advice.
Walmart and Petsmart have inexpensive heaters. (Not sure about Petco, since there isn't one near me.) When you return the gravel, net, decorations and 2nd fish, the refund you receive should be more than enough to purchase a heater for your tank.