I'm positive my cyano issue was due to the massive amount of Golden Pearls I added to my home made food. I totally forgot how potent that stuff was, and how badly it causes cyano to bloom if you overfeed with that stuff.
Prodibio surely had nothing to do with it. I stopped using that food, and the main tank has a tiny spec of it in three places now. And everything is looking cleaner at last. Here's a full tank shot:
