Orchid126 is right, liquid seaweed is a great fertilizer. Fish emulsion is also good, but it stinks. I only use it outdoors. The following link of product has both fish and seaweed mixed together. After my sister's 10 years of organic gardening, I've decided that it's six of one and half dozen of the other!
http://gardenharvestsupply.com/produ...27&pageStyle=P
Worm tea also sounds good, but haven't tried it myself.