This feeder fish (rosy minnow/fathead minnow) looked like it had parasites under its skin, a few others in the tank had similar. Look familiar? : r/Aquariums

SOS rosy minnow issue ?? : r/petsmart

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Toledo Goldfish Rosie Red Minnows - Versatile Live Fish Perfect for Aquariums or as Feeder Fish for Ponds - 0.5-1.5 Inches, 100 Count : Sports & Outdoors

Rosy Red Minnow Care - Pimephales promelas

This feeder fish (rosy minnow/fathead minnow) looked like it had parasites under its skin, a few others in the tank had similar. Look familiar? : r/ Aquariums