Honestly, you got me. I would post on the MBI and see what they have to say. You could ask Gresham, too, but that kind of stuff might be proprietary info that he might not be allowed to share.
Unfortunately, I'm crap at culturing algae. I've never tried Nanno because I can't see any reason to. I think I kept the temp of T. Iso. a little too low. I got one good split off that, but otherwise all dead algae. What are you attempting to gut-load? Rots? I like Reed's stuff for that (it's easy for one thing). It's better to just grow copepods, though.