After one day of cultivation, 81.9 ± 6.3% of the ammonia (NH3) was removed in tanks containing Ulva, and by the third day, 89.1 ± 4.7% of the nitrate (NO3–) was removed. After five days of cultivation, 98.2 ± 3.7% NH3 (H = 1.1; P = 0.56) and 98.4 ± 3.0% NO3- (H = 2.7; P = 0.25) and 62.1 ± 0.0% of phosphate (PO43-) (H = 0.0; P = 0.90) were also removed by the three macroalgae