7 Editor’s Page by Marc Levenson
8 Reef Notebook
• “Noah’s Ark” at Burgers’ Zoo: Divers place corals for important conservation projectby Corine Konings
• Recently discovered, flower-shaped starfish species feeds on wood by Judith Jördens
14 Reef Visions by Matt PedersenFEATURE ARTICLES22 Substrate: a case for why it’s beneficial by Dr. Dieter Brockmann
28 Bottom Substrate: the Biological Engine by Daniel Knop
42 Bottom Substrate: Importance & Maintenance by Dr. Dieter Brockmann
50 Substrates for the Marine Aquarist by Richard Greenfield
52 A Tour of Interzoo 2024 by Claudia Hafner
60 Crown-of-Thorns Sea Stars—voracious beauties by Dr. Horst Moosleitner and Dr. Dieter Brockmann
66 Secret Bay: Bali’s Bay of Spirits by Werner Fiedler
74 Aquarium Portrait: From small reef to room divider by Stefan TripkeDEPARTMENTS
81 Species Spotlight: Threadfin Butterflyfish Chaetodon auriga by Dr. Dieter Brockmann
86 Public Aquarium Showcase: The Karlsruhe reef—coral keeping on a mega scale by J. Charles Delbeek M.Sc. and Johann Kirchhauser
104 Events Calendar
106 LFS Locator: Outstanding aquarium shops
108 CORALexicon: This issue’s scientific & technical terms
110 Reef Marketplace: The marine products showcase
112 Advertiser Index
114 Reef Life by Alex Rose
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