Unsure if the live plankton food you bought to feed your corals is actually alive? Tired of making the trips to the fish store to buy overpriced food additives? Well, make your own. Growing phytoplankton cultures has become very popular and very easy to do. With pre-made kits available online or getting a seed population from a fellow hobbyist, you can throw together a very inexpensive setup to crank out fresh live phyto on a weekly basis. In fact, most phyto growers make so much that they often sell it to stores or give it away to fellow hobbyists.