Killing Asterina stars

[asylumdown]

yah, i looked in to those, but this is a tiny little 5 gallon pico tank that I use to quarantine corals, I empty it out when I'm not using it, so I don't really want to invest in an animal that I would then need to care for/do something with. There's nothing in my big tank to feed a harlequin shrimp and there's not enough of the stars in the QT tank to justify buying one.

I'm more wondering if there's something chemical that I can do as a dip, as I'm trying to avoid this from becoming an ongoing problem that requires biological control. I will sterilize the QT tank when I'm done, I just want to make sure there's none on the coral.