Actually, I am going to change my vote. I totally missed the stocking list showing that you had a nudibranch. You are right, my nassarius do more of a zig/zag pattern, and not spiral.
It does look like a flatworn after re-looking at the picture.
Most likely those are nassarius eggs. If I remember correctly, ceruth lay them in long lines, also on the glass.
My nassarius have started laying eggs also. I thin it has to do with a recent temperature change I had in my tank.
Yes...the one from AquaDome is the picasso and the other is the fire clown from Aquatek...I had to get the fireclown because Carson pointed out that he has one "tear" on the side of his cheek....I know...sappy analogy....
Oh-oh.. that clown has a tear tattoo? Sounds like trouble to me!
Moving this out of emergency and into the normal reef keeping discussions.
I for one like the palys. But like others said, it just depends on your goals for the tank.
Top down makes it really hard to put little things in there and see them. I think most people use their sumps as a timeout zone for bad fish/inverts that they take from the main display.
With that said, you probably could do some of the non-reef safe starfish. Or like you said, a lobster (though they hide a lot).
I am unsure of the requirements for something like a horseshoe crab (though I suspect they might outgrow 50g).