Guppy Care Guide
Guppies are one of the best beginner fish, colorful, hardy, and endlessly entertaining. But keeping them really well requires knowing what they actually need.
Water Parameters
Guppies are adaptable but thrive in warm, slightly hard water. They come from slow-moving rivers and streams in South America where water has a slight alkaline tilt.
Breeding
Livebearers That Breed Fast
Guppies are livebearers, females give birth to live fry instead of laying eggs. A single female can give birth to 20–100 fry every 4–6 weeks, and can store sperm for months, meaning a female bought from a pet store can keep producing fry even without a male present.
For a community tank, maintain a 2:1 female-to-male ratio. Males constantly pursue females, and outnumbering males reduces stress on females. Without a ratio balance, females can become stressed and ill from constant harassment.
Fry survival
Adult guppies (including parents) will eat fry. Add floating plants like hornwort or java moss for cover, or use a breeder box to protect fry until they're too large to be eaten.
Controlling population
Guppies reproduce rapidly. If you don't want fry, keep only males, only females, or donate/sell excess to a local fish store. An overcrowded tank degrades water quality fast.
Gestation
Gestation lasts about 21–30 days. Look for a dark "gravid spot" near the female's tail, it's the shadow of the developing fry through her skin and darkens before birth.
Feeding
Guppies are omnivores and will eat almost anything you offer. Variety keeps their immune system strong and their colors vivid.
Compatible Tank Mates
Guppies are peaceful community fish but their long, flowing tails attract fin-nippers. Avoid any fish species known to nip fins in your particular tank.
Common Diseases
Guppies are hardy but susceptible to stress-induced illness. Stable water chemistry and regular partial water changes prevent most common diseases.
Fin Rot
Signs: Frayed, receding, or discolored fins
Rx: Improve water quality with partial water changes; antibacterial medication if severe
Ich (White Spot)
Signs: Small white granules on body and fins, scratching against objects
Rx: Raise temperature gradually to 82°F, aquarium salt, specialized ich treatment
Columnaris (Guppy Disease)
Signs: White or gray patches on body, frayed fins, usually rapid progression
Rx: Antibiotic treatment (erythromycin, kanamycin); isolate affected fish
Guppy Bloat (Dropsy)
Signs: Swollen belly, raised scales with "pinecone" appearance
Rx: Epsom salt bath, antibiotics; prognosis is typically poor once scales raise
Keep a parameters log
Most guppy illness traces back to a water quality event, a spike in ammonia after overfeeding, a temperature drop from a cold room, or nitrates creeping up. Logging parameters monthly lets you correlate health issues with water conditions.
Male vs Female Guppies
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