Curious... what does your cleanup crew look like
With your history of Dino’s, I would choose the PhosGuard if you have high phosphate.
Sounds like you have it under control. A lot of people with lots of experience are on this site gotta be somebody a lot smarter than me that can chime in. Just has to something... do you use RODI.
What’s the least destructive urchin and do they eat hair algae