i have used a dropper and pipette and dosed drops directly on the bba. If you follow the dosing with a water change, i suppose a higher dose can be applied however a little peroxide goes a long way so be patient.
i'd agree also that peroxide is way cheaper than excel at about $1 a medium sized bottle from cvs, walgreens or any drug store near you where a comparable sized bottle of excel runs about $7.99
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