Your levels are "perfect" because the algae is eating the excess nutrients as fast as they are released. Almost every tank has some cyano
in it, but it jumps on imbalances and nutrients like a fat kid on cake. If you have any deadspots, the nutrients will float over that area for a longer period giving cyano
a chance to bloom. I would do a PWC
and do a lights out for a couple of days. Turn lights on for a day and do another PWC
and black out for a couple of days. I did this when I had a HA problem due to the phosphates in my tap water. Hermits may not eat it all, but they will help mow it down. I also used Astraea Snails to eat what was mowed down and all HA was gone after a week.