Brackish Starfish?

[freshwater/marine?]

I recently noticed brittle stars crawling around my 20gal. The salinity is 1.013
What do I do now?

 

[AMS]

Virtually every species of Echinoderm is marine, there are not even a handful of brackish ones. If it is a brittle star it's most likely a marine species and will eventually die.

 

[three-fingers]

That's pretty cool, but unfortunate. Do you know where it came from?