Randy Holmes-Farley
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With dinos at least I know water changes add more dissolved minerals apparenltly for them to grow upon, I belive it's the same for cyano, correct me if I'm wrong
All pests (as well as all other photosynthetic organisms) need many trace elements. One reasonable theory that fits with dino problems and the way reefers find cures is that they may be able to be be beaten by limiting trace elements in various ways (less water change, more growth of algae and/or other organisms). Low nutrients actually seems to "help" dinos, possibly because low nutrients slows the growth of competitors for some trace element.
That method doesn't seem to fit as well with cyano. More often it seems to be "hurt" by low nutrients and also low organics.