Just for clarification...
The 75-150 mg/L dosage range is meant to only be used as a 30 minute bath treatment, as outlined here:
https://www.reef2reef.com/threads/hydrogen-peroxide.640232/
In most cases, you can safely dose 3% Hydrogen Peroxide in a reef environment every 12 hours at a dosage range of 1ml per 8-10 gallons. This is already being done to combat cyano, dinos and various nuisance algae. The problem with dosing in a reef environment is light, gas exchange and other factors will decompose H2O2. Which will possibly drop it below "therapeutic" (for parasite purposes) before you can safely administer the next dosage.