Did you
reduce flow in the tank?
cover to block ANY ambient light?
monitor/buffer ph at 8.4/8.5 during the whole time?
added nothing else but top off water and buffer?
no water changes done?
I've battled dino's twice and this method has worked wonders both times,if it did not get them all,I would continue treatment for another 4 days.I've seen reefers want to tear thier tanks down because of dinos,persistance is the key,keep fighting.
If a second attempt fails,start researching hydrogen peroxide dosing/treatments,it's a newer method showing promising results on dinos as well as many other tank ailments and algaes,buuut,how risky is it?IDK,luckily,i've never had to try it.But from everything i've read so far on it,it would be a consideration of mine.