I want to like these guys experiments, but they really need to add some negative controls.
That's pretty small tank- how are we not sure those algaes wouldn't just reduce naturally over 9 weeks? Low bioload, smallish volume. Also, no corals, so any comment on report she that it harms some lps from the big thread?
Some things in this hobby are just a leap of faith. Study, plan, confer with other hobbyist and then leap. It is not like adding fish with no QT That is different
And I think these guys have seen it all, and from experience know that that stuff does not just disappear on its own. I have used it and I have not seen any harm from it, and the hair algae that was growing is looking like zip zero nada. I do have a little bit of green cyano but it is oddley pretty. And will be gone in no time.
I think it is safe to try. A little stressed coral I can live with. It is not snake oil but it is not chemo either. My dinos were just killing me.