Thalassia testudinum

Turtle grass is a fully submerged marine seagrass native to the Caribbean and Gulf of Mexico, making it suitable only for saltwater aquarium or marine habitat restoration projects. It requires clear, nutrient-poor, full-salinity seawater and bright light to thrive, and is extremely difficult to maintain outside its natural coastal environment. This species is best left to specialist marine horticulturists or ecological restoration professionals.