2ml/g of peroxide is way less than what many others dose it. the only plant i have found that doesnt like it at all is hornwort (literally melts overnight), but so far its the only one that seems affected by it. 1ml/g of excel is about the max dosage, but anyting less is not effective. i only use the combo in my larger tanks (120g), where dosing with a syringe is just not doable. for smaller tanks, i spot treat wth the max amount being the above doses based on tank size. i do account for gravel etc, and reduce accordingly.
now i know i am supposed to treat the root cause of the algae, then i wont have to kill it with chemicals. but my root cause is week or longer trips with no one to keep up the ferts and monitor the tanks which are heavily stocked and planted (wife will only feed fish). i travel 4-6 times a year for bussiness so it is a re-ocurring event.