Vаllіѕnеrіа аmеrіаnа

Vаllіѕnеrіа Amеrіcаnа, also known as eelgrass, tape grass, wild celery, and water celery, is very useful for keeping free-floating algae at bay. Unlike other aquatic plants that that grow leaves long enough to float on the surface, wild celery plant leaves grow in clusters from their roots. The clusters form a thick cover at the surface, which helps to control algae.