Found these on an older piece of live rock that was given to me. Tank is 2 months old and the suspected hydroids are not spreading. Moved the rock to quarantine tank just in case. Any ideas on I'd? They are tiny and evenly spread out on the rock.
yep droids. I dabbed gel superglue over mine and they went Bye-Bye. 2nd time I encountered some, I treated for GHA with Vibrant and noticed they vanished. Not saying Vibrant will eradicate them but ironically happened with treatment.