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I'm a 16-year-old student who can't work at the moment due to coronavirus outbreak. I spent most of my money on a 30-gallon fish tank, and now I've purchased a 3.5-gallon tank for my new guppy fry so the other guppies don't eat them. I thought the tank came with a heater which it doesn't sadly. I don't have enough money to purchase the 10 watt heater.