They either eat something that only a long established tank can grow (and even then they eventually always run out and starve), or they are serial killers that mow everything in their path if they're not fast enough.
True story; when I had harlequin shrimp I tried housing the chocolate chip starfish with my mantis shrimp to see if she'd killed them, instead the starfish actually caught and killed a perfectly healthy and fast mantis overnight. Was far from a pleasant experience and never kept them with anything that breathes since.
Going down the list of whats known to be available in the hobby, literally nothing sticks out by your description other then serpents and some brittles.
Only one i'm not too sure on is bat starfish but I'm pretty sure they're also predatory and some are cold water.
Aquilonastra starfish do just fine in reef tanks and in my experience do no harm to corals or other inverts. They eat the film-algae and bacterial films that are present on rocks and other surfaces inside the tank. Only thing they may damage is coralline algae.
And of course they may become a plague due to the ability of some species to reproduce rapidly via fission. A systematic revision of the asterinid genus Aquilonastra OʼLoughlin, 2004 (Echinodermata, Asteroidea)
Aquilonastra starfish do just fine in reef tanks and in my experience do no harm to corals or other inverts. They eat the film-algae and bacterial films that are present on rocks and other surfaces inside the tank. Only thing they may damage is coralline algae.
And of course they may become a plague due to the ability of some species to reproduce rapidly via fission. A systematic revision of the asterinid genus Aquilonastra OʼLoughlin, 2004 (Echinodermata, Asteroidea)
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