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The problem is the size of the tank. Both of those are scavengers and need big tanks to find bits of food or microbes (for the starfish). You could put extra food in there but that would eventually foul up your water. The only thing I can think about in a ten gallon tank would be asternias. I see some people don't care for them but I do. They have never been an issue in the 17 yrs I have had my tank. Your LFS would probably give them to you. Good luck on your tank.