polyclad flatworm

Would this be a flatworm that could be killed by using flatworm exit? I currently have a sixline(been in for 2months) and a yellow coris wrasse(just added yesterday) but this population on my euphyllia keeps coming back and it kills like a head each month even when dipping every week for four...

So I think I have atleast 1 polyclad flatworm, I have seen what I suspect to be one, I didn't get a great view but I think that's what it was. I am going to make a trap that I have seen people making online but the only issue is I can't get any clams. Nowhere seems to have any fresh or frozen so...

I added a sleeper goby to my tank about 2 months ago, and it went missing about 3 days ago. No major changes to water parameters - everything kept in check. I have the tank covered so it couldn't have jumped, it has plenty of fine sand to sift through, as well as plenty of hiding spots, and was...