How to catch brittle stars?

[Mr.nintendo]

So the last few frags I added to the tank ahd some little hiding suprises, about 8-9 brittle stars, a few black and normal.

Now if I only saw one of two I wouldn't mind so much, but this many in my 33g is to much. They seem to grow pretty dam quick and I want a few if not all out.

anyone have any ideas or links as to how I could attract or catch them? they break apart so easy you cant really just grab them by the visible arms