What do you do with the small starfish?

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I run a filter sock over the drains where they enter the bubble tower in the sump. Problem is, when I change the sock out, I can find 20+ of the small brittle starfish inside. As they are all still alive, been picking them off then placing in the either the main part of the sump or back to the tank but it's getting to be a hassle.

Don't want to kill anything but really thinking about rising them down the drain with the rest of the crud. Wondering what do others do?