[Coraldynamics]

I agree with GreshamH, live phyto are not needed to keep healthy rots going. I use Instant Algae's Rotifer Diet (simply highly concentrated Nanno) I keep it frozen and thaw only what I need for a months use. Nanno's cell walls are sturdy enough to handle freezing and thawing. Freezing will greatly increase the shelf life of the product.

My rotifer cultures are in great shape and all they get are IA.

Hope this helps.