Guillards or a modified Guillards are still readily available. I use the modified Guillards f/2 from Florida Aqua Farms, which is also sold through Aquatic Ecostyems (who also sells other brands of Guillards). It is the way to go. Forget the Miracle grow nonsense. As for ordering Rots at the same time, get the resting rotifers (sort of like brine shrimp cysts) and you'll be able to wait till the phyto is going well to start them. All supplies and starter cultures you could want are available from either the two places I mention, with FAF usually being slightly cheaper.
BTW, the same dedication to sanitation you need for brewing will serve phyto culturing very well
