Treatment Protocol for Planaria (Flatworms in Tank)
Fenbendazole (Panacur) is the safest treatment — 0.1g per 10 gallons, kills planaria within 72 hours. Safe for fish but LETHAL to snails. Remove snails before treatment. No-Planaria (betel nut extract) also effective. Planaria traps can reduce population. Reduce feeding to starve remaining worms.
How to Identify This Condition
Look for these symptoms in your fish:
- Small white/brown flatworms on glass
- Arrow-shaped head visible with magnification
- Worms in substrate and on surfaces
- Shrimp deaths (planaria eat shrimplets)
Early detection is critical — the sooner you begin treatment, the better the prognosis. Observe your fish daily during routine feeding for any behavioral or physical changes.
Root Causes
Understanding what caused the problem helps you prevent recurrence:
- Overfeeding — excess food feeds planaria
- Introduced on plants or driftwood
- Poor tank hygiene
Recommended Medications
The following medications are effective against Planaria (Flatworms in Tank):
- Fenbendazole (Panacur) — follow manufacturer dosing instructions. Treat in a hospital/quarantine tank when possible to avoid disrupting your main tank's biological filtration.
- No-Planaria — follow manufacturer dosing instructions. Treat in a hospital/quarantine tank when possible to avoid disrupting your main tank's biological filtration.
- Planaria traps — follow manufacturer dosing instructions. Treat in a hospital/quarantine tank when possible to avoid disrupting your main tank's biological filtration.
Always have these medications on hand before you need them. See our quarantine tank guide for proper treatment setup.
Water Quality During Treatment
Maintain pristine water conditions during treatment. Perform 25% daily water changes using Seachem Prime as your water conditioner. Remove activated carbon from your filter during medication (carbon absorbs medications). Increase aeration with an air stone — sick fish need extra oxygen. Monitor ammonia and nitrite daily with your test kit.
Recovery & Quarantine
This is generally a mild condition. Most cases resolve within 1-2 weeks with proper treatment. Continue monitoring after symptoms clear.
Prevention
The best treatment is prevention. Follow these practices to reduce the risk:
- Don't overfeed
- Remove uneaten food promptly
- Dip new plants in alum solution
- Regular substrate vacuuming
- Maintain clean tank
For a complete prevention strategy, read our quarantine tank guide and maintenance schedule.