Seachem Purigen & Macro Algae

[chromakey]

Good Day:

I added to a package of Purigen to my 28 gallon JBJ reef aquarium two days ago and today the macro aglae (halimeda) I have in my display tank has turned white. Will the Purigen strip my water to the point that it will affect the macro algae?

I am running an Aquamaxx skimmer and also GFO & carbon in my media basket.

Also, I just added a pouch to my Nuvo 8 gallon reef tank. Is this overkill for this size? I have the same macro algae in there as well.


Thanks,
Michael

Picture from two weeks ago.