UPDATE:
ok the elec bill droped 40 buxs. but she still wont let me use a heater. i told her i can use it at night but put a glass sheet on top of the tank to trap heat during the day, but i dont know if she will let me..... i told her i will pay extra.. grandad will let me he even told her to let me but she said im not gunna get what i what all the time, said that we dont use a heater so why should the fish. i told her where the fish is from the temp rarely goes lower then 78 degrees. she just tells me to shut up...