I Released Creatures Into My NEW Giant Lagoon Vivarium

My Giant Lagoon Vivarium, Lumantia, is finally ready to be populated by creatures. After cycling the tank for over a month, the brackish habitat is ready to house an ecosystem of aquatic organisms. There is just one problem: an outbreak of diatoms (brown hair algae), marking the "ugly stage" of the lagoon's saltwater cycle period. But I had just the plan and creatures to help clean up the mess. Question is: will they be able to handle the dangers associated with the changing tides?