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Beginner here with a Reefer 350 set up, 4 weeks in now.
I've just added two clownfish recently and have some cleanup crew already in there, cured live rock and live sand.
Anyway, noticed this little guy moving around after I cleaned out a filter sock. It was pretty tiny.
A young birstleworm or something else?
First little creature I've seen that I havent bought!
should I be concerned?

I've just added two clownfish recently and have some cleanup crew already in there, cured live rock and live sand.
Anyway, noticed this little guy moving around after I cleaned out a filter sock. It was pretty tiny.
A young birstleworm or something else?
First little creature I've seen that I havent bought!

should I be concerned?



