How often should a red swordtail’s water be changed?
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Expert Answer
Change a red swordtail’s water every 3 to 5 days, replacing about a quarter of the tank. They are not demanding on water; keep it clear with regular changes.
They resist cold and survive 18-30 C, but grow best at 22-26 C, so keep that range and use a heater in winter for stable temperature and health.