Growing the Phalaenopsis Orchid (Moth Orchid)
Check out my article on Phalaenopsis Care in the article library. Growing the Phalaenopsis Orchid (Moth Orchid)
It discusses fertilizer application. I would get an orchid fertilizer available from big box stores. You can also use a fertilizer like Miracle Grow. When you do, be sure to mix your fert at 1/4 the recommended amount. Read the article I link you to and that should help some too.