I did a third dose this evening in 2 different tanks:
1.) My 90 display which would grow HA on the pumps only. I've been scrubbing them and recently the HA has grown into select areas of the back wall and along the water line. At the time of starting dosing, there was minimal algae in there. As of a few days ago, that tank is completely HA free from what I can tell.
2.) My 20L in my bedroom is pretty much covered in HA. I did a small water change the other night and just ran the siphon through the algae and I was completely shocked at the amount of HA that came out without even trying to remove it. I've taken pics the day after each dose and I'll post the series after a couple more doses.
No issues with any other livestock including fish, corals, inverts and most macro. The only macro issue I've had (which is a blessing - not an issue) is it seems my Lobophora infestation is withering back too.
Paul_PSU - strange you're having a lack of results. Considering the circumstances, I'd probably stop the dosing too. If anything I'd scrub and siphon as much of it out as you can first, then start dosing again after a few weeks time. Hopefully you'd have better results.