Dear Billy,
Welcome here!
With regards to your question on fertilizer, the ideal concentration to maintain are:
NO3 - 5~15 ppm
PO4 - 0.5~2.0 ppm
K - 5~15 ppm
You may want to consider using Hagen fertilizers which I find very effective, see below pic and URL:
Visit their website, there is dealer information for USA.
http://www.hagen.com/usa/aquatic/pro...01076850020101
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