Fish Quarantine FAQ: Tank Setup and Duration
Quarantine isolates new fish for 14-30 days before introducing them to your main display. The goal is to spot ich, columnaris, internal parasites, fin rot and stress-related disease before pathogens spread to your existing stock. A bare 20-40 litre tank with sponge filter and heater is the standard quarantine setup. This fish quarantine faq from Gensou Aquascaping at 5 Everton Park covers protocol and equipment, and this guide answers the 10 questions Singapore aquarists ask most about fish quarantine.
Why bother with quarantine?
Singapore aquarium shops mix imports from Indonesia, Thailand, Vietnam and Malaysia in central holding tanks. A new fish that looked clean on day of purchase often shows ich, fin rot or internal parasites within five days. Skipping quarantine means your established display catches everything — losses run from a single fish to a full wipeout depending on pathogen.
What size tank do I need?
20-40 litres is sufficient for most community fish. Bare-bottom — substrate harbours pathogens and is hard to clean. A small sponge filter, heater (if cooling needed), simple LED, and a few PVC tube hides for security. Avoid plants and decorations that complicate medication and cleaning. Browse small tanks for dedicated quarantine units.
How long should quarantine last?
14 days minimum for hardy community fish, 21 days standard, 30 days for delicate species like discus, wild-caught imports or known disease-prone stock. Most pathogens reveal symptoms within the first 14 days under stable conditions; a 21-day window catches the slower-cycling parasites like camallanus worms.
Should I medicate prophylactically?
Optional but useful for batch imports. The “Tank Transfer Method” plus prazi-pro (internal parasites), and a low-dose ich preventative like API General Cure cover most issues without harsh treatments. For wild-caught fish, run prazi alongside daily observation. Stock treatment products in advance — sourcing during a crisis adds 2-3 days delay.
What water should I use?
Cycled water from your main display tank — instant biological filtration. If your main is not cycled or you do not have one, run the quarantine tank for 7-14 days before introducing new fish, or seed it with a spare sponge filter from another setup. Bare cycle, with conditioner, but never raw uncycled tap.
What do I look for during observation?
Daily checks: appetite, fin position, breathing rate, any spots or fuzz, scratching against decor (flashing), faecal colour and consistency. Lethargy past 48 hours, white spots, clamped fins or stringy white faeces all warrant treatment. Photograph day 1 versus day 7 — subtle changes are easier to spot in side-by-side images.
How do I move fish from quarantine to display?
Drip acclimate over 30-60 minutes to match parameters, especially TDS and pH. Net the fish to avoid transferring quarantine water that may carry pathogens. Add lights-off for the first 24 hours in the new tank to reduce stress and aggression from existing stock.
Can I quarantine in a bucket?
Short-term yes, with daily 50 per cent water changes and a small air-stone. A 10-litre food-grade bucket supports a small fish for a week. For proper 21-day quarantine, a dedicated tank is far easier. The investment in a 30-litre quarantine tank pays back the first time it saves your main display.
Should I quarantine plants?
For commercial plants, snail dipping (alum bath or Seachem Reef Dip) for 1-3 minutes kills snail eggs and hydra. Tissue-culture plants are sterile and skip this. Do not use copper-based dips on aquarium plants destined for shrimp tanks — copper persists in plant tissue.
What about quarantining shrimp?
Cherry and crystal shrimp benefit from a 14-day shrimp-only quarantine in matched-parameter water. Watch for vorticella (white fuzz on appendages), planaria and bacterial infections. Add a single Indian almond leaf for tannin antimicrobial benefit. Use only shrimp-safe medications — copper and most antibiotics kill shrimp instantly. Source proper kit from aquascaping tools.
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Still Have Questions About Your Tank?
Drop by Gensou Aquascaping — most walk-in questions get answered in under 10 minutes by someone who has set up hundreds of tanks.
5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
