My first order of macro algae arrives tomorrow (from Gulf Coast Eco)! Do I quarantine and for how long?
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When I've ordered from them the macroalgae was high quality but inevitably contained some amount of hitchhikers, particularly with rooted algae like Penicillus, so if possible it's probably a good idea unless you need it immediately. I've also been a lot of species of macros in ReVive coral dip without any ill effects (just be sure to dip again in new salt water before putting into any tank containing livestock, even a QT tank), which might reduce the chance of introducing pests as long as you're fine with potentially killing beneficial invert hitchhikers. How long I guess would depend on what specific things you're concerned with.