Moss in hydrophonics

A question from a fellow grower:

I have a caretaker that grows my meds hydroponically. He has a manual watering system and I have noticed that he has moss growing on his cubes. What should he do about that? What does he need to do to get rid of this?? Please let me know what I should tell him!

Algae you mean , I think peroxide but I’m no hydro guy , I’ll chime in someone who might can help ?

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