Pond Boss Forums INTRO Questions & Observations weeds good for oxygen levels in ponds?

In my pond there is also a bright green algae that develops under the ice in the winter time that looks like a filamentous algae FA that I always like to see because many plants die away in winter. The important thing is to clear some snow off the ice so sunlight can get to the plants and produce oxygen. I forgot last winter and paid the price with a fish kill.