Some of these monsters can work in a Water deck but there are better cards that people always choose instead. "Fortress Whale" seems to be the most used one because since he is a ritual card, the player can summon another monster during the same turn, there is an auto duel deck on the site using him. "Cure Mermaid" and "Piercing Moray" are situational cards, but can be an option to fit in the Water deck.
Thank you for visiting Duel Links wiki by GameA! We update this Yu-Gi-Oh! Duel Links community day by day to provide quality guides and the latest news.