I'm beginning to really agree with Simpte's signature. In plant fertilization issues, ignorance is bliss! I simply don't want to get into this stuff!
Although I will comment on one thing: putting nutrients into the water column means that algae can access it as well as plants. Putting it into the substrate, even if it makes it harder for plants to get at it, means that it's not available to algae. So it seems to me, without having any in-depth knowldge of any of this stuff, that it might be easier to get your plants growing without getting too much algae by having a rich substrate rather than rich water.
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