Coq: Advanced has a good reputation with my friends, as do many other brands. If you haven't bought it yet I'd like to suggest you investigate Technaflora's, "Recipe for Success." I've been using it for two years now and I really like it. All you need is a set of measuring spoons and it's formulated to go from the seedling stage all the way to harvest with smooth transitions in between. You can get a sample kit for about $30 and in an Aerogarden it will last you a long time.