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Nope, I have to disagree, please don't skip the heater. The heater will help prevent temperature fluctuations, which can be very stressful for your betta. The heater, along with the filter, is one of the most important things for a betta to have.Tman2902 said:However as long as you live somewhere worm you could potential skip the heater assuming by your question you are on a budget.
If OP went with one of those, they'd have to make sure to purchase a proper filter and heater for it.Justin Love said:I have a medium sized critter keeper from petsmart that is about 3 gallons that I use for a quarantine tank, but if 3 gallons is your absolute maximum, I would suggest this.