pest · saltwater tank

Vermetid Snails

Vermetid snails are sessile snails that build thin tube-like calcium structures on rock. They cast a mucus net to catch food; the mucus irritates nearby coral.

Reviewed by Fast Aquatics husbandry team · Updated May 2026

Severity: Mild but irritating to nearby coral

Symptoms

White or tan tube-like growths on rock
Mucus strand visible at the tube opening
Coral retraction near the tube
Multiplying over time

What causes it

Hitchhiked in on rock or live coral.

Treatment options

Always treat in a separate quarantine tank.

Manual removal. Crush the tube + use a syringe to inject calcium hydroxide paste (kalk). Paste dissolves the tube and kills the snail.

Bumblebee snail (Engina). Bumblebee snails reportedly eat vermetids. Mixed effectiveness; works for some keepers.

Prevention

Aquaculture-only rock + dipping new pieces.

Frequently asked questions

What does Vermetid Snails look like?

White or tan tube-like growths on rock. Mucus strand visible at the tube opening. Coral retraction near the tube.

What causes Vermetid Snails?

Hitchhiked in on rock or live coral.

How is Vermetid Snails treated?

Manual removal: Crush the tube + use a syringe to inject calcium hydroxide paste (kalk). Paste dissolves the tube and kills the snail.

Can Vermetid Snails be prevented?

Aquaculture-only rock + dipping new pieces.

How fatal is Vermetid Snails?

Mild but irritating to nearby coral

Browse the full disease database for 45 aquarium conditions with treatment protocols, or check the care library for prevention-focused husbandry guides. Use our symptom matcher to rank likely diseases from observed signs, the water parameter checker to diagnose related water-quality issues, or the QT timeline calculator to plan a treatment schedule.