Aren't we already growing algae in the ocean about as fast as we can? Is there more we could be doing than manufacturing fertilizer on a geological scale and le

Aren't we already growing algae in the ocean about as fast as we can? Is there more we could be doing than manufacturing fertilizer on a geological scale and letting a lot of it end up washing out to sea? (Honest question, I haven't thought about this avenue of geoengineering before)