I have been having good luck with my betta so far since the day I got him. I ordered a heater that I heard works extremely well for bettas and it arrived a couple days after. I let it sit in my 10 gal and let it run for about 30 minutes a realised that there was no change in the temperature. So I checked the heater and it wasn't warm. I checked the reviews for the heater and just realised that it was meant for 1.5- 5 gallons. To make sure it wasn't broken I added it to a 2.5 gallon tank I had and put my thermometer in there and after a few minutes the temperature was about 80 Degrees Fahrenheit. I'm leaving for a road trip in 1-2 days and I purchased some vacation block food for bettas and the heater for when I leave. I'll be gone for five days and we're going to off the heat and I'm worried. I've asked my friends and they said it should be fine. The heater won't even heat up in the 10 gallon and I can take my chances of asking my parents for another heater. What is my best bet and what should I do?