Planaria Trap and Treatment Guide for Aquariums
Few uninvited guests unsettle aquarists quite like planaria — flat, arrow-headed worms gliding across the glass in unsettling numbers. If you have spotted them, this planaria trap treatment aquarium guide from Gensou Aquascaping at 5 Everton Park, Singapore, will walk you through identification, removal and long-term prevention. Left unchecked, planaria prey on shrimplets, fish eggs and small snails, so acting quickly matters.
Identifying Planaria vs Detritus Worms
Not every worm in your tank is planaria. Detritus worms (Tubifex and rhabdocoels) are harmless, thin and round in cross-section. Planaria have a distinctly triangular head with two eyespots and a flat, ribbon-like body typically 5-15 mm long. They glide smoothly rather than wriggling. A simple test: place a piece of raw chicken liver against the glass overnight. Planaria will cluster on it by morning, making identification straightforward under a magnifying glass.
Why Planaria Appear
Overfeeding is the primary driver. Excess protein — uneaten pellets, thawed bloodworms left in the substrate, decaying shrimp moults — fuels their population explosion. Tanks with heavy bioloads and infrequent gravel vacuuming are especially vulnerable. In Singapore’s warm climate, where tank temperatures sit at 26-30 °C year-round, planaria reproduce faster than they would in cooler setups, so populations can spiral in a matter of weeks.
Building a DIY Planaria Trap
You can fashion an effective trap from a small plastic container with a screw-on lid. Drill or punch 3-4 mm holes around the sides — large enough for planaria to enter but small enough to exclude most shrimp. Drop a thumbnail-sized piece of raw meat or frozen bloodworm cube inside, seal the lid and place it on the substrate overnight. By morning, dozens of worms will be trapped inside. Repeat nightly for a week to knock the visible population down before moving to chemical treatment.
Chemical Treatment: Fenbendazole
Fenbendazole (sold as Panacur or Safe-Guard for pets) is the gold standard for planaria elimination. Dose at 0.1 g per 40 litres of tank water, dissolved in a small cup of warm water before adding. A single dose kills planaria within 48-72 hours. Perform a 50% water change on day three, vacuum dead worms from the substrate, and dose again if any survivors remain. Fenbendazole is shrimp-safe and plant-safe at this concentration, making it ideal for planted Neocaridina or Caridina tanks.
Alternative: No-Planaria (Betel Nut Extract)
No-Planaria is a popular commercial product available on Shopee and at local fish shops around Serangoon North. It uses betel nut palm extract to kill flatworms. Follow the packet instructions — typically one scoop per 50 litres, dosed once daily for three days. Remove carbon from your filter before dosing. Snails, particularly Neritina species, are sensitive to this treatment, so relocate them beforehand. After the treatment course, run activated carbon for 24 hours and do a large water change.
Protecting Shrimp During Treatment
Both fenbendazole and betel nut extract are generally safe for shrimp, but weakened or freshly moulted individuals can be stressed by dead planaria decomposing and fouling the water. Increase surface agitation during treatment to boost oxygen levels. Remove dead worms promptly with a turkey baster or pipette. If your colony is particularly valuable — high-grade Taiwan Bees, for instance — consider treating in a separate quarantine container first and only moving shrimp back once the main tank is confirmed clear.
Prevention: Keeping Planaria Away
Feed sparingly and remove uneaten food within two hours. Vacuum the substrate during weekly water changes, paying attention to corners and underneath hardscape where detritus accumulates. Quarantine new plants by soaking them in a mild alum solution (one tablespoon per litre for 2-3 hours) before adding them to your display tank. Maintaining a clean tank with a disciplined feeding schedule is the single most effective planaria deterrent — no chemical can substitute for good husbandry.
When to Seek Professional Help
Persistent infestations in large or complex setups — built-in office displays, custom paludariums — can be difficult to treat without disrupting livestock. Gensou Aquascaping, with over 20 years of hands-on experience, offers tank maintenance services that include pest diagnosis and targeted treatment. A planaria trap treatment aquarium guide gets you most of the way, but sometimes a professional eye catches hidden reservoirs you might miss, such as worms living inside canister filter housings or sump compartments.
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