Marimo moss balls sold at pet stores have been found to be contaminated with Zebra mussels.

Watch out for invasive zebra mussels in aquarium 'moss balls

INVASIVE ZEBRA MUSSELS on MARIMO MOSS Balls: What's the Latest? — Ep. 235

STATE ALERT: Zebra mussels found in aquarium moss balls - The Stanly News & Press

DNR warning: Check your aquariums for a potentially invasive species

Invasive Zebra Mussels Reported in Marimo Moss Balls - AS Magazine

CPW warns of invasive mussels found in state pet store product, Environment

help! What are these white specks in my new moss ball? Was rinsing before putting into my betta tank and found them. Thanks ! :) : r/Marimo

Conservation Officer Service - UPDATE The Conservation Officer Service can confirm zebra mussels have been found on moss balls in Terrace. CO's collected the contaminated moss balls today, after a woman

Pest Alert: Zebra Mussels Found in “Moss” Balls — Oregon Invasive Species Council