to expand on outcasts post, you can measure your pH and kH and use the chart also.
Crazy Loaches, I would normally agree with you here, but I have to tell you, recently, I have been adding a greater amount of PO4 and have still been getting GSA. If I recall correctly, I was somewhere around 3 ppm. So, that can't be the only cause...but I am sure its a culprit.
Yea, he probably is a bit low... but by looking at the growth on some of the swords, i would lean toward K and N, but again, I may be wrong accross the board on this.
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