Yes, my 13w UV didn’t help either. And in my friend's tank his 18w UV didn’t do anything. The diatom filter definitely helps a little with the spores but it gets clogged extremely fast so its not so helpful overall. Slow current seems to allow it to attach to things more easily...
chiahead - i also tried excel ODing, i did x3, x4 and x5 overdosing and didn’t really notice much of a difference
this stuff doesn’t seem to respond as easily as other algae.
guaiac_boy - nitrates are in 20's, i know by titration test kits, and looking at visual plant responses. The tests are pretty good with accuracy, they respond correctly with known amounts in test samples.
Hopefully the more people post about this the quicker we can gain a thorough and detailed understanding of this algae, and find way to get rid of it.