Need help to id this worm

[gdc0910]

Hi, have found this type of worm 3 times(total 6 worms and counting) in quarantine tank after increasing cupramine dosage. Please help to id

[JMW]

Bristleworm, from the pic, looks like the harmless variety which stays about 1" in length

[gdc0910]

2 hours ago, JMW said:

Bristleworm, from the pic, looks like the harmless variety which stays about 1" in length

I didn't have them when I started quarantine, only appeared after dosing cupramine, which means they came from inside the fishes?

[Ranz]

second to bristle worm. 

do you have rock or sand in the quarantine tank, or only fishes?

[gdc0910]

1 hour ago, Ranz said:

second to bristle worm. 

do you have rock or sand in the quarantine tank, or only fishes?

There's a small piece of rock from main tank, but unlikely from it, cos I cupramine treated main tank some time back, never saw any worms then after, so don't think it's from that rock...can they be from internal of fish? I am running QT for mandarin and Midas blenny

[Ranz]

my guess is it is more likely to come from the live rock than the fish. 

although you cupramine treated the rock before doesn't mean you got all the worms. 

in any case bristle worm is not a bad thing for the tank. 

[apple123]

Bristle worm.

[gdc0910]

Thanks guys. Have a great day!