What you are really in for: Hand cleaning, hard work siphon and rasp-removing of accumulations and invasions outside the tank and doing massive water changes is 90% of this thread, peroxide is 10%. We almost never dose peroxide into the tank water, this is a you-work-physically-hard as catch-up...
Test readings don't matter in nano reef algae challenges. They may matter in large tank challenges but not small tank challenges.
Cleaning removes the things that measure as bad params, before they become bad params
inside that thread, against algae there is the equivalent of:
hughes v gracie
that guy who scissor legged anderson silva
the orona slam by rampage
all the things randy c ever did.