No you don't need to. There are certain other advanced nutes that can help bring out the flavors. Sometimes a deficiency may arise and you may need to treat that. ie. magnesium def. and the use of epsom salts.
Fox Farm is one of the best ones out there, and you dont need nothig else ,but i personaly would use Super Thrive with it for Veg stage to growit quicker.
thats right , thats the reson most people here dont do like they say on the back of the bottle, ask here or just use search engine and type name of your nuts and read you see what ppl do on early stages or later down the road. honestly the best way is to ask before you do it