Help choosing heater for my tank!

[guppielover]

Hey guys I bought a fish tank off a guy and I forgot to ask what size the tank was i bought it because it was cheap ($10) and big but now I'm having trouble looking for a heater that will work without getting messed up, i will post some pictures of the tank and its dimensions. Thanks!


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[rlederer]

Your tank is about 40 gallons and you need a heater of 150 watts.