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That's a Bluestripe Fangblenny, they mimic cleaner wrasses and bite bits off of large fish. It should be safe with fish around it's size but I wouldn't risk it as they nip at the gills and fins of larger fish.

I had our engineer goby since it was a juvenile and it definitely did not look like that.
Looks more like a species of gudgeon dartfish.
I'm going with Curious Wormfish, or Yellow Stripe Wormfish. Looks like there are several kinds.
Edit: Changing my guess to what Mr. Knightley says below.
Definitely not an engineer; that I do know…I think haha
Bluestripe Fangblenny
Agreed.![]()
I've never owned a Bluestripe blenny myself so I can't comment on that, but they are naturally semi-parasitic and nip the fins of other fish. I'm not sure if it would be okay with small fish, I think it would though. Check it out online if you can, sorry I can't help!

