I agree that a vendor's definition of a pest and even one reefer vs another reefer's definition of a pest can and does vary. That's why I find leaving an honest review about a vendor difficult. I had to change my terminology in a review once because a vendor believed I was misleading people using the word "pest." According to the vendor, all tanks have algae, but I introduced Bryopsis and turf algae to my quarantine tank even after dipping. It took over my quarantine tank and an extended floconazole treatment had to be done. My whole tank was thrown out of whack after the treatment. I lost some of my more sensitive coral frags, and most of my anemones, and I'm still trying to get things back in order in that tank months later...so yes, I define some algaes as pests, even plagues. If it means anything, the cleanest frags I've ever purchased came from Aqua SD. I would not hesitate to buy from this vendor again.
All tanks do have algae. If you think you can 'QT' out algae I disagree.