Fish tank beginner guide

{{whyLabel}}: Larger tanks are more stable and forgiving for beginners because waste is diluted in a higher volume of water.

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• Choose a standard rectangular shape for better gas exchange.
• Opt for glass over acrylic to prevent easy scratching.
• Ensure the tank includes a lid to prevent evaporation and jumping fish.

{{doneWhenLabel}}: [The tank is purchased and ready for placement]

{{whyLabel}}: A filled 20-gallon tank weighs over 200 lbs (90 kg) and direct sunlight causes uncontrollable algae growth.

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• Use a dedicated aquarium stand or a solid wood cabinet.
• Ensure the surface is perfectly level to prevent glass stress.
• Keep at least 15cm clearance from walls for equipment access.

{{doneWhenLabel}}: [The tank is placed in its permanent, shaded location]

{{whyLabel}}: The filter is the life support system, providing mechanical and biological filtration.

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• Select a filter rated for at least 20-30 gallons.
• Look for models with adjustable flow rates.
• Ensure it has space for sponge (mechanical) and ceramic rings (biological) media.

{{doneWhenLabel}}: [Filter is purchased and matches tank capacity]

{{whyLabel}}: Tropical fish require a stable temperature to prevent stress and disease like Ich.

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• Get a 50W to 100W adjustable submersible heater.
• Buy a separate glass or digital thermometer for accuracy.
• Avoid "preset" heaters that cannot be adjusted.

{{doneWhenLabel}}: [Heater and thermometer are ready for installation]

{{whyLabel}}: Substrate provides a home for beneficial bacteria and a base for plants.

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• Choose 20 lbs of inert gravel or coarse sand.
• Pick smooth rocks or driftwood for natural hiding spots.
• Avoid sharp decorations that could tear fish fins.

{{doneWhenLabel}}: [Substrate and decor are ready to be cleaned]

{{whyLabel}}: Tap water contains toxic chlorine, and invisible ammonia can kill fish without a test kit.

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• Buy a liquid drop test kit (pH, Ammonia, Nitrite, Nitrate).
• Purchase a concentrated water conditioner (dechlorinator).
• Avoid paper test strips as they are often inaccurate.

{{doneWhenLabel}}: [Water chemistry tools are on hand]

{{whyLabel}}: Soap and household cleaners leave toxic residues that are lethal to fish.

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• Use a new, clean sponge and warm tap water.
• Wipe down all interior glass surfaces.
• Rinse thoroughly and dry the exterior.

{{doneWhenLabel}}: [Tank is free of dust and factory residues]

{{whyLabel}}: New substrate is covered in fine dust that will make your water permanently cloudy if not removed.

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• Place substrate in a clean bucket.
• Run water through it while stirring by hand.
• Repeat until the runoff water is completely clear.

{{doneWhenLabel}}: [Substrate is clean and ready for the tank]

{{whyLabel}}: Proper placement creates a natural look and prevents equipment from being buried.

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• Slope the substrate from 1 inch in the front to 3 inches in the back.
• Place heavy rocks directly on the glass (before substrate) if they are large.
• Position driftwood to create caves and visual depth.

{{doneWhenLabel}}: [The tank's interior layout is finalized]

{{whyLabel}}: Chlorine must be neutralized immediately to allow beneficial bacteria to grow.

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• Place a plate on the substrate to prevent the water stream from digging holes.
• Fill with room-temperature tap water.
• Add the required dose of water conditioner immediately.

{{doneWhenLabel}}: [Tank is full and water is chemically safe for bacteria]

{{whyLabel}}: Water must circulate and reach a stable temperature before the biological cycle begins.

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• Prime the filter by filling its chamber with water before plugging it in.
• Set the heater to 25°C (77°F).
• Wait 15 minutes before plugging in the heater to let it calibrate.

{{doneWhenLabel}}: [Equipment is running and water is circulating]

{{whyLabel}}: Bacteria need "food" (ammonia) to grow. This is the "fishless cycle" method.

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• Add a small pinch of fish food daily OR use pure liquid ammonia.
• Aim for an ammonia reading of 2.0 ppm on your test kit.
• Do NOT add fish yet; they would suffer in these conditions.

{{doneWhenLabel}}: [Ammonia levels reach 2.0 ppm]

{{whyLabel}}: Nitrite is the second stage of the cycle and indicates that the first colony of bacteria is working.

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• Use the liquid test kit to monitor Nitrite levels.
• Expect a spike in Nitrite around week 2 or 3.
• Keep the water temperature stable at 25°C to speed up growth.

{{doneWhenLabel}}: [Nitrite levels are detected and rising]

{{whyLabel}}: The cycle is complete only when bacteria can process all waste into Nitrate.

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• Continue adding a tiny amount of ammonia source every few days.
• Test for Nitrate; its presence confirms the cycle is near completion.
• The cycle is done when 2ppm of Ammonia disappears within 24 hours, leaving 0 Ammonia and 0 Nitrite.

{{doneWhenLabel}}: [Ammonia and Nitrite are 0 ppm; Nitrate is present]

{{whyLabel}}: The cycling process leaves high levels of Nitrate, which must be lowered before adding fish.

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• Use a siphon to remove half the water.
• Refill with dechlorinated water of the same temperature.
• Do not clean the filter media yet; you need the bacteria.

{{doneWhenLabel}}: [Nitrate levels are below 20 ppm]

{{whyLabel}}: Some fish are too sensitive for a new tank. Hardy species ensure early success.

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• Choose Zebra Danios, Neon Tetras, or Guppies.
• Ensure all selected species are compatible in temperature and temperament.
• Start with only one species to avoid overwhelming the new bacteria.

{{doneWhenLabel}}: [Fish are selected and purchased]

{{whyLabel}}: Sudden changes in temperature or pH can cause "osmotic shock" and kill fish.

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• Float the sealed bag in the tank for 20 minutes to equalize temperature.
• Open the bag and add a small cup of tank water every 5 minutes for 15 minutes.
• Use a net to move fish into the tank; discard the store water.

{{doneWhenLabel}}: [Fish are swimming in the tank]

{{whyLabel}}: Overfeeding is the #1 cause of fish death in new tanks due to ammonia spikes.

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• Feed only what they can eat in 2 minutes, once per day.
• Watch for gasping at the surface (low oxygen) or hiding (stress).
• Keep lights off for the first 24 hours to help them settle.

{{doneWhenLabel}}: [Fish are eating and acting normally after 48 hours]

{{whyLabel}}: Regular water changes remove nitrates and replenish essential minerals.

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• Use a siphon to vacuum the gravel while removing water.
• Always treat new water with conditioner before adding it.
• Match the temperature of the new water to the tank water.

{{doneWhenLabel}}: [Weekly maintenance is completed]

{{whyLabel}}: Tap water contains chlorine that kills the beneficial bacteria in your filter.

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• Fill a bucket with water removed from the tank during a water change.
• Gently squeeze/rinse the filter sponge in this bucket.
• Never replace all media at once; only replace chemical media (carbon) if used.

{{doneWhenLabel}}: [Filter flow is restored without killing bacteria]

{{whyLabel}}: Small daily checks prevent equipment failure and keep the tank looking pristine.

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• Use a magnetic scraper or soft sponge to wipe the glass.
• Verify the thermometer reads 24-26°C.
• Ensure the filter is flowing silently and steadily.

{{doneWhenLabel}}: [Daily check is finished]