I find this thread interesting and wonder how much it relates to the Biome cycle experiment currently under way at BRS. There is a ton of real experience out there in fighting this like cyano that work for some but not for others. I get the impression that is because the things that are unseen and untested in our tanks make more of a difference than we thought, and a little bit of a shotgun approach "may" fix it, but it might not.
That said,
@ReefGeezer , have you tried adding a healthy dose of copepods to your tank? That is probably pretty close to "filtration in a bottle"!
Just curious. It helped mine, and I tried every non-chemical remedy, but I ended up having to use chemiclean at half the recommended dose to finally get rid of it. I am sure it was a biome imbalance issue, but since I didn't and can't measure that now, I will never know.