With a deficit or a wrong ratio phosphate-nitrate, the products Nitro or Fosfo can be used to bring back the content of NOand/or PO4 to the desired value. Plants have a need for all nutrients. That means that healthy growth without algae is only possible if all conditions are complied with: light-CO2-N-P-K etc. If there are elements missing, then the growth will start to falter or can even stop. If the growth falters, processes are not finalized and plants will start toleaksugars. It is just these sugars which activate algae spores and algae to grow. Algae are much less sensitive to the deficit of or the lack of a nutrient and therefore the matter is to offer all elements from the Golden Triangle to prevent (algae) problems.New views teach us that nitrate and phosphate are not a reason for algae formation. It is precisely a lack of these macro elements which lead to algae formation, again by the leaking of sugars from the plant. Of course a very high content of phosphate (>2,0 mg