What Does My Snail Have on Its Shell?

May 19, 2026

Falcareef

Community Member

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Hi, I recently got 5 Trochus snails, and this one came with an extra “decoration” on its shell. I’m not sure if what it has is harmless or not. Thanks!

May 20, 2026

martin.a

Active Member

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If you mean the 'hair', it looks like red hair algae to me.

May 20, 2026

BryanM

7500 Club Member

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If it were me I'd scrape that off outside the tank.

May 21, 2026

Bob Loblaw

Well-Known Member

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Gelidium sp, remove it outside of tank as stated.

WHICH TYPE OF MISTAKE TAUGHT YOU YOUR MOST EXPENSIVE REEFKEEPING LESSON?

Moving too quickly or adding too much at once
Votes: 8 29.6%
Skipping—or shortening—quarantine or dipping
Votes: 5 18.5%
Buying the wrong equipment the first time
Votes: 4 14.8%
Ignoring maintenance, warning signs, or redundancy
Votes: 9 33.3%
Chasing numbers or making too many changes
Votes: 3 11.1%
Choosing incompatible fish, corals, or invertebrates
Votes: 5 18.5%
Poor aquascaping or tank-design decisions
Votes: 2 7.4%
Failing to research an animal’s needs
Votes: 1 3.7%
Trusting bad advice
Votes: 4 14.8%
Doing something on the tank when you should've gone to bed
Votes: 5 18.5%
Something else—tell us below
Votes: 4 14.8%
I’m still waiting for my first expensive lesson!
Votes: 3 11.1%

What Does My Snail Have on Its Shell?

Falcareef

Community Member

martin.a

Active Member

BryanM

7500 Club Member

Bob Loblaw

Well-Known Member

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WHICH TYPE OF MISTAKE TAUGHT YOU YOUR MOST EXPENSIVE REEFKEEPING LESSON?

Moving too quickly or adding too much at once

Skipping—or shortening—quarantine or dipping

Buying the wrong equipment the first time

Ignoring maintenance, warning signs, or redundancy

Chasing numbers or making too many changes

Choosing incompatible fish, corals, or invertebrates

Poor aquascaping or tank-design decisions

Failing to research an animal’s needs

Trusting bad advice

Doing something on the tank when you should've gone to bed

Something else—tell us below

I’m still waiting for my first expensive lesson!

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