Bringing Home New Aquarium Fish

By Dr Duncan Houston BVSc – Bringing a new fish home begins a critical acclimation period. In this vet‑certified 2025 guide, we walk you through a detailed 30‑day plan—from tank setup, acclimation, and cycling, to feeding, water care, stress checks, and telehealth support through the Ask A Vet app—to give your new pet the best start.

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📅 Week 1: Setup & Acclimation

✅ Tank planning

• Select the right tank size: beginner-friendly freshwater tanks are 20–30 gal—bigger is safer. :contentReference[oaicite:3]{index=3}
• Choose tank shape based on fish type—long for danios, tall for angelfish. :contentReference[oaicite:4]{index=4}
• Gather substrate, live plants, décor for hiding and stable biofilm support. :contentReference[oaicite:5]{index=5}

🔧 Equipment setup

• Install filter sized at 4–10× tank volume/hour. :contentReference[oaicite:6]{index=6}
• Add heater (75–80 °F for tropical fish) and thermometer. :contentReference[oaicite:7]{index=7}
• Use lighting on timers—8–10 h/day or according to plant needs. :contentReference[oaicite:8]{index=8}
• Install air stone or ensure surface agitation for oxygen. :contentReference[oaicite:9]{index=9}

🌡️ Tank cycling

• Wait 7–10 days for fishless cycling: measure ammonia, nitrite, nitrate levels. :contentReference[oaicite:10]{index=10}
• Use products like API Quick Start if unavailable to wait. :contentReference[oaicite:11]{index=11}
• Only add fish when ammonia and nitrite have dropped to zero. :contentReference[oaicite:12]{index=12}

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📅 Week 2: Introducing Your Fish

🛬 Acclimate slowly

• Dim lights, float sealed bag to match temperature. :contentReference[oaicite:13]{index=13}
• Add tank water in small steps every 15 minutes to balance pH and temperature. :contentReference[oaicite:14]{index=14}
• Net–transfer fish and discard transport water. :contentReference[oaicite:15]{index=15}
• Quarantine new fish for 2 weeks to prevent disease transfer. :contentReference[oaicite:16]{index=16}

⚠️ Early fish care

• Feed sparingly—small portions they eat in 2–3 minutes once or twice daily. :contentReference[oaicite:17]{index=17}
• Monitor closely for stress: jumping, flashing, erratic swimming, or appetite loss. :contentReference[oaicite:18]{index=18}
• Test water daily (pH, ammonia, nitrite). Partial water changes (10–20%) if needed. :contentReference[oaicite:19]{index=19}

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📅 Week 3: Establishing Stability

🔄 Regular maintenance

• Perform weekly 20–25% water changes; siphon debris. :contentReference[oaicite:20]{index=20}
• Clean filter media monthly with tank water to preserve beneficial bacteria. :contentReference[oaicite:21]{index=21}
• Adjust light duration if algae blooms appear. :contentReference[oaicite:22]{index=22}

🍽 Optimizing diet

• Diversify with flake/pellet diets plus frozen/live protein (brine shrimp, bloodworms) 2–3 times/week. :contentReference[oaicite:23]{index=23}
• Feed in sync with fish routines and remove uneaten food within minutes. :contentReference[oaicite:24]{index=24}
• Consider occasional fasting or veggie offerings (spirulina). :contentReference[oaicite:25]{index=25}

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📅 Week 4: Health Check & Enrichment

🧪 Water & fish evaluations

• Continue weekly testing—ensure ammonia/nitrite = 0, nitrate <20 ppm. :contentReference[oaicite:26]{index=26}
• Watch behavior and appearance daily—look for signs of illness such as fin damage, lethargy, flashing. :contentReference[oaicite:27]{index=27}

🎨 Add enrichment

• After fish are comfortable (usually Day 21), add new décor or plants to encourage natural exploration. :contentReference[oaicite:28]{index=28}
• Rearrange rockwork carefully to stimulate interest without disorienting fish.

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🩺 When to Call Ask A Vet

Throughout the 30‑day period, use the Ask A Vet app for:

• Water log reviews and parameter interpretation
• Assessing behaviors or early disease signs via photos/videos
• Guidance on dosing treatments, ammonia issues, or quarantine protocols
• Feedback post-room lighting, filter change, or new decoration

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📋 30‑Day Quick‑Start Tracker

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🔗 About Ask A Vet & Continued Support

The Ask A Vet app connects you to aquatic animal veterinarians 24/7. Share tank specs, videos of behavior, and water data to get tailored advice on disease prevention, treatment plans, diet optimization, and habitat adjustments. AquaCare starter kits include test kits, water conditioners, stress-relief products, micro diets, and quarantine essentials. Download now to ensure your new fish get the healthiest start in 2025! 🐠📱💙