misc wild algae are great for feeding to plants...as far as making the fertilizer im pretty sure the trick is that its supposed to be fully soluble and if you use organic ferts they are presumably bound to some sort of organic material.....im thinking if we got really elaborate we could make a compost tea with guano, yeast, worm castings, eggshells and urine probly humic acid and seaweeds and stuff too....at which point there is probably still more of a concern of residual contaminates than with the "pure chems"...at the very least its infinitly more complicated and experimental then adding a few ml of know substance into some clean water...thus i find it difficult to fully proceed, need more reference points/info sources/ collaborators.... once i get my new cultures up and running i can send out live samples that can be propagated, they go out free to anyone contributing to the experiment/project