Pistol Shrimp and Goby Pairs: Guide for UK Reef Tanks

The Best Relationship in the Tank

Shrimp-goby pairs are one of the most fascinating natural behaviours observable in a home aquarium. A nearly blind pistol shrimp teams up with a watchman goby — the shrimp builds and maintains a shared burrow while the goby stands guard. They maintain constant physical contact via the shrimp's antenna, and the goby signals danger by flicking its tail, sending both back into the burrow.

Setting Up a Pair

The goby — Yellow watchman goby is the most reliable choice. Wheeler's and Randall's shrimp gobies also work well.

The shrimp — Tiger pistol shrimp is the standard. Randall's pistol shrimp is smaller and sometimes pairs more readily. Avoid larger snapping shrimp species.

Substrate — At least 5cm of sand, ideally mixed with some rubble. The shrimp needs to dig a proper burrow. Bare-bottom tanks won't work.

Introduction method:

1. Add the goby first, let it settle for a few days
2. Add the pistol shrimp nearby
3. They usually find each other within hours to days
4. If they haven't paired within two weeks, they probably won't — but both will be fine independently

What to Expect

• Constant excavation — the shrimp moves huge amounts of sand
• The sentinel pose — the goby perches at the burrow entrance while the shrimp works
• Tank rearrangement — secure rockwork on the glass bottom, not on sand, or the shrimp will undermine it

The Click

Pistol shrimp produce a loud snapping sound audible from across the room. It's startling at first but completely normal — they snap to stun prey, warn off intruders, or apparently just because.

Tank Size

A shrimp-goby pair works in tanks as small as 60 litres. They stay close to their burrow, making them perfect for nanos. Pre-paired specimens are ideal if available, but buying separately usually works fine.

Has anyone had success pairing unusual species combinations?