That's why it's so interesting, in a kind of sicko way. I went thru this last summer with my 75. I began to wonder after talking to Fishfood if my problem had been Dinoflagellates instead of the Cyanobacteria I thought it was. But I didn't lose any fish or inverts, BUT, I was running carbon and eventually cuprisorb which may have removed enough toxins. So after reading I came to the question of whether one could actually tell Dino's from Cyano without a microscope. Does it matter which it really was? No.
I did find it interesting that they were both actually flagellates, which I assume is how they move. Back to my question, they are so close it seems (from my novice reading) how can one be classified as a bacteria? Single celled? Multi celled? What they eat for breakfast? Maybe I don't really need to know, not being a scientist...
Fishfood, thanks for the food for thought, although I had a nice break from it for awhile.

I really do find it fascinating.
Andrew, my dad was telling me they had a huge problem in the heavy water systems in Nuclear Reactors. Being a microbiologist, he got a real kick out of listening to the ideas on how to get rid of them. That water is incredibly rdioactive, but they seem to like it.