What coral would you advise people to avoid in a saltwater tank?

When considering the addition of corals to a saltwater aquarium, it is essential to acknowledge not only their aesthetic allure but also their ecological compatibility and maintenance requirements. Amongst the vast array of species available, certain corals demand particular caution.

One species often advised against for novice aquarists is Palythoa, known for its potential toxicity. It harbors the potent toxin palytoxin, which if mishandled, can pose significant health risks. Therefore, unless you're well-versed in handling such species, it might be prudent to leave Palythoa off your list.

Another coral to approach with caution is the Galaxea coral. While visually stunning with its vibrant polyps, it is notorious for its aggressive nature. Galaxea has long, sweeping tentacles that can extend significantly at night, endangering neighboring corals by stinging them.

Moreover, Goniopora, or “flowerpot corals,” though captivating with their floral appearance, are often best avoided due to their demanding care level. They require very specific water parameters and established tanks, which can prove challenging to maintain consistently.

In summary, when curating your own underwater Eden, it's wise to balance beauty with practicality, ensuring a harmonious and thriving aquatic ecosystem.