Was it biopellet?

[Cal_stir]

Me three with the biopellets, I built a recirculating reactor and had the effluent going straight into my skimmer, tank became infested with hair algae which I could not rid (system was 2 years old with zero algae and I was trying to eliminate the use of GFO), ended up using algaefix to rid the algea and quit the pellets, algae never returned.

Keep up the carbon
Good luck!