Algae issues using Red Sea AB+ / Vinegar dosing question

[SPS2020]

Reviving an old thread as I ran into an issue with AB+ and PO4 levels. I started noticing GHA tufts in various places in my Acro dominant tank. Never had GHA previously. Was dosing about 30-40 ml of AB+ daily in ~110 gal total volume. Decided to check PO4 via Hanna ULR Phosphorous checker and saw a whopping 43PPB! Normally, it has be zero for the last year. That explains the GHA LOL. Feeding schedule has been the same throughout and no additional stock has been introduced. I'm stopping the addition of AB+ for now. Once I get the PO4 back down (GFO is on the way), I'll restart the AB+ and monitor the PO4 closely as I believe it is being raised by the AB+.

 

[BigBabich]

I wish I read this thread before I started AB+ dosing.
HOLY CRAP do I suddenly have a monster hair algae problem.
My clean up crew is laying in the corner on the couch with their top pants button undone like they just had thirds at thanksgiving and it's still totally out of control.