Hi,

I've been producing large amounts of Gracilaria fertilizing with about equal amounts of NH4NO3 and (NH4)3PO4 once a week. I help produce the Gracilaria for feed for abalone and have been seeing some epiphytic growth of green filamentous algae. Is this a good ratio or should I reduce the amount of phosphate because I've heard the red algae don't require as much/or any of it? What about KNO3? Would the Gracilaria get better growth, less fouling from green algae with KNO3? I'd appreciate any guidance here. Thanks!

Christine