I have some type living red colored species taking over my reef tank. They look like tiny red arrows on my glass and sand. Not sure if these are harmful to my corals. Can anyone help me identify them?
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Yes! I think your right “flatworms”. I’ll be getting a six line wrasse to hopefully to eat them up.If they are moving they might be
How to eliminate Flatworms (Red Planaria) | Melev's Reef
Small reddish-rust colored creatures may already be in your tank. Or you may buy a coral and they'll appear as hitchhikers later. They may appear on the glass/acrylic, on the substrate, or on live rock. Due to their extremely thin bodies, they are called flatworms correctly. They appear almost...www.melevsreef.com

