Rathbun's Dwarf Cup Coral

About

Found in the tropical waters of the Western Atlantic, Astrangia rathbuni is a sessile stony coral that spends its entire adult life anchored in place, filter feeding from whatever current passes by. Like all corals in its family, it falls under CITES Appendices protections, meaning any specimens in the hobby should come from verified, legally sourced channels. Something worth confirming before purchase. Because sourcing documentation for this species can be tricky to trace, it tends to show up infrequently in the trade. Care requirements place it in the intermediate category, so it is better suited to hobbyists who already have some experience maintaining stable reef systems. It appreciates strong lighting and moderate water movement, the kind of conditions that keep its tissues healthy and support whatever zooxanthellae or prey capture sustains it. Being reef safe, it poses no threat to other invertebrates or corals sharing the tank. As with most small stony corals, the real challenge is long-term stability. Consistent water chemistry and attentive husbandry matter far more than any single parameter. If you can provide a well-established reef environment and have done your homework on sourcing, this is a genuinely interesting piece of Western Atlantic natural history to keep.