does anyone know how you can tell if and when the sandsifting starfish (or any starfish for that matter) is dead? The star has part of one arm (or is it leg?) missing...not sure if it was eaten or just from being unhealthy...I was going to remove it from the tank thinking it was dead but decided to give it one last chance and somehow it is now attached to the glass of the tank, sucking away...the tank is 35 gallons and i have 2 other stars and an anemone and lastly a BIMAC OCTOPUS. I don't think the octo did this, but i'm not positive. Up to this point (about a month), the octo hasn't been combative or destructive with his tank mates. All seem to peacefully coexist. Any advice is appreciated!