What’re these little guys

Eldritch_blast · Feb 28, 2022

Hello! Few days after the latest frag I added, I’ve started spotting these guys on the glass. Hoping critter and not pest!

Have been busting out tweezers during my dips to strip everything I can.

Cruisin on the glass
Video Micrograph

DancingShark · Feb 28, 2022

They remind me of flatworms. But it's been a very long time I haven't seen one.

PeterEde · Feb 28, 2022

flat worm would be my guess

Eldritch_blast · Feb 28, 2022

Oh no

DaJMasta · Feb 28, 2022

Definitely a flatworm, hard to say if it's something that will eat corals or not (most do not). If you have the space to keep it quarantined for observation, that's definitely best practice, but a dip should do a good job for the adults, if you want to keep after it, you can pull the frag and redip every day or two (may not matter if they're already out in the tank, though.)

Often flatworms that are coral predators look like what they eat for camouflage, so the coloration suggests it's probably not that, but it's certainly worth keeping an eye on.

ohnoitisjoe · Feb 28, 2022

They’re flatworms, I have them in my tank. Haven’t caused me any problems, with coral or fish, though there are several species. As far as I can tell though, they’re identical to mine.
But if you want to lower their numbers then springeri damselfish or coris wrasse will eat them

Eldritch_blast · Feb 28, 2022

ohnoitisjoe said:
They’re flatworms, I have them in my tank. Haven’t caused me any problems, with coral or fish, though there are several species. As far as I can tell though, they’re identical to mine.
But if you want to lower their numbers then springeri damselfish or coris wrasse will eat them

Maybe they’re not from my latest frag then.

maybe it’s because my wrasse is no longer with us as of 2 days ago