Spirulina (assuming you mean Arthrospira platensis and A. maxima) is also halophilic. There are some Freshwater Spirulina spp., but I don't know where you'd be able to get it. Do you have a university nearby with a decent biology department (where in Canada are you?)? They're usually culturing a few algae species, and might be willing to give you some, or at least tell you where to go for axenic cultures.