One of the reasons many aquarists are drawn to hammer coral is the combination of beauty and hardiness. It is harder than some popular small polyp stony corals, making it a great coral for intermediate and advanced hobbyists. But healthy hammer coral in Canada does depend on parameters like decent flow, stable salinity and appropriate calcium and alkalinity. https://wakelet.com/wake/Z5hzSS5MYGkj_fE4zzd0q