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Had that very same thought when I read Brandon’s post last night. I found a list of 23 species (no idea how authoritative this list is) but found pictures for only 3 so far. They looked like green hair algae. I am thinking that we should not assume all reported instances of GHA are the same species, or even a Derbesia species, especially since so many aquarists mix up the classification of diatoms, dinoflagellates and cyanobacteria. Of course, this does not mean peroxide worksThere are many species of GHA some might just be more resistant to peroxide dosing than others.