There are many brands of good quality chemical and organic fertilizers for hydroponics,and it depends on the type of feeding system you're going to use(ebb-flow,dwc,nft...)after you can decide which one you're going to use,so you will make the best choice,my personal favorite is the "General hydroponics flora series"a 3 part mixture thats adjusted for each phase of growth....bonbon http://www.genhydro.com