I think that is high. 1ml/10. There are better ways. take rock up and really get in there and scrub like a grinder. Pumps off spray target area with syringe. Third broadcast. I don’t know how many days to dose. Some use a maintenance dose. I’m not sure on those specifics. Keep in mind it is a stronger oxidizer then bleach so I’ve read. How much bleach you wanna put in there?
I've dosed upto 1.5ml per 10 gallons with no adverse effects. Can't say it did anything to help with my dino problem either though. I quit dosing that amount after a month and not seeing any difference. YMMV