How to Set Up a Quarantine Rack System for Multiple Species
Every serious fishkeeper eventually learns the hard way that skipping quarantine costs more than the tank it requires. A dedicated quarantine rack system setup lets you isolate, observe, and treat new arrivals across multiple species simultaneously without cross-contamination. This guide from Gensou Aquascaping at 5 Everton Park, Singapore, covers the practical details of building a functional rack from scratch.
Choosing the Right Shelving
Heavy-duty powder-coated metal shelving rated for at least 100 kg per tier is the standard. Avoid wooden shelves — they warp and rot from inevitable splashes. A common configuration in Singapore fishrooms uses a 120 cm wide, 45 cm deep, 180 cm tall rack with four tiers. This accommodates four to eight individual quarantine tanks depending on size. Bolt the rack to the wall if you live in an HDB flat or condo, as a fully loaded rack can weigh 300-400 kg and becomes a tipping hazard on smooth tile floors.
Tank Selection and Layout
Standard 30 x 20 x 20 cm tanks (roughly 12 litres) work well for small fish, shrimp, and juvenile stock. For larger species or fish that need swimming space during quarantine, use 45 x 30 x 30 cm tanks (around 40 litres). Braced tanks are preferable here — they are cheaper, stack more safely, and support fitted lids that prevent jumpers from escaping.
Leave at least 15 cm clearance above each tank for maintenance access. Label every tank with a whiteboard sticker noting the species, arrival date, and treatment protocol. This simple habit prevents dangerous mix-ups when you are medicating one tank but not another.
Filtration: Shared or Individual
Never share filtration between quarantine tanks. A centralised sump connecting all quarantine units defeats the entire purpose — one sick fish contaminates every tank on the system. Use individual sponge filters powered by a single linear air pump. A Hailea ACO-series pump running at 60 litres per minute drives 8-10 sponge filters comfortably and costs around $30-50 on Shopee or Lazada.
Mature your sponge filters in an established tank for at least two weeks before deploying them. Uncycled quarantine tanks are a common cause of ammonia spikes that stress already-vulnerable new arrivals.
Heating and Temperature Control
In Singapore, ambient temperatures of 28-30 °C suit most tropical species without additional heating. For cool-water quarantine — hillstream loaches or white cloud mountain minnows — position the rack in an air-conditioned room or use clip-on fans. Small 25-50 W adjustable heaters fit neatly inside individual tanks for species that need precise temperature control during treatment, such as the heat method for ich at 30-32 °C.
Water Change Workflow
Efficiency is everything when you are managing multiple tanks. Keep a dedicated set of buckets, siphons, and nets for the quarantine rack — never share equipment with your display tanks. Colour-code your tools if needed. A 20-litre bucket on a small trolley speeds up water changes across eight tanks considerably.
Change 30-50% of the water every other day during active treatment, daily if medicating with strong chemicals like formalin or copper. Pre-mix and dechlorinate replacement water in a large storage tub — a 60-litre Toyogo container from a local hardware store costs under $15 and holds enough water for a full round of changes across the rack.
Standard Quarantine Protocol
Observe new arrivals for a minimum of 14 days — 21-28 days is safer for wild-caught or imported stock. During the first week, watch for flashing, clamped fins, white spots, rapid breathing, or loss of appetite. If symptoms appear, identify and treat accordingly. If the fish remains symptom-free through the full quarantine period, it is reasonably safe to move into your display tank.
Some hobbyists prophylactically treat all new arrivals with a broad-spectrum protocol: salt at 1-2 grams per litre for the first week, followed by praziquantel for internal parasites in the second week. This approach is common among discus and African cichlid keepers who import stock frequently.
Space and Electrical Considerations
A quarantine rack needs access to at least two electrical outlets for the air pump and any heaters or lights. Use a waterproof power strip mounted above the highest water line — never below tank level. In Singapore’s HDB utility areas or bomb shelters, which many hobbyists repurpose as fishrooms, ensure adequate ventilation to prevent humidity buildup that damages walls and promotes mould growth. A small dehumidifier or exhaust fan running during the day makes a significant difference.
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emilynakatani
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
