05-10-2013, 06:55 AM
Plants clear algae because they compete for nutrients. Underwater oxygenating plants really help, also as mentioned water hyacinth because they have such large underwater roots. So I like to plant a lot of underwater plants to help with this. You can get some of the common ones at the pet stores and put some in a bucket of water to reproduce before planting. My Koi will eat them if they aren't pretty well established before planting in the pond.