Words of Advice....

[TheReefGeek]

Here is a good picture of them in case others have them.

[Kryten]

I have things that look kinda like that, but they're not red. Would those still be a problem?

[Matt]

Interesting... not to dismiss Lee's original point, I know some reefers deliberately don't dip chaeto because it contains a lot of pods and other good stuff.

I've had red flatworms too. I got excited, and dipped a lot of the corals I found them on. Killed a couple of corals that way... The flatworms got siphoned out with water changes, and they just disappeared later. Here's a nice article from the excellent Melev's Reef site.

AFAIK, they don't eat corals, but they can "smother" them when they get to plague proportions. When they die off, they release a toxin which can be harmful if it is too concentrated (too many at once).

Anyway, like so many other reef pests, they seem to come and go peacefully most of the time for most folks. When they do find the right balance for population explosion, they can apparently become quite a problem. I'd safe the "exit" products for those times.

BTW, the white ones aren't considered a problem, most of the time.

Back to the OP's point. Dipping / QT: good.

[TheReefGeek]

Kryten, do they have the same shape, or are they more rounded? They could be baby snails if they are rounded.

There are so many different types of these worms.

[Kryten]

The shape of mine may be a bit more rounded, but still flat, if you know what I mean. I don't think they are snails as they are multiplying in my fuge. I just always thought they were pods of some kind.