Here is a good review titled: Use of allelopathy of aquatic macrophytes for algal-bloom control.
Hu and Hung talked about Macrophyte species which have allelopathy effects on Algal-bloom.
This paper discussed the development and potential application of allelopathy of aquatic plants on algae, including the reported aquatic macrophytes having allelopathy on algae, their allelochemicals and potential modes of action on algae, possible ways for application and the prospect of using aquatic macrophytes to control algal bloom.
Plants which you want to use for allelopathy effects on algal bloom, must of course be marine.
But sometimes allelopathic agents of terresterial plants can be extracted and use for this purpose more commercial than marine planting.