I have been messing around with the microscope to find that one drop of H2O2 at 3% (10 vol) quickly kills all the ostreopsis in 50 ml.
As 1 ml equals about 43 drops, it means that I could kill all the pest with just 0,35 gal of H2O2. As H2O2 is very very unstable, I presume it won't last long in the aquarium as to hurt higher creatures such as fish or inverts.
I will go with half dose tonight when the dinos swim free in the water. Wish me luck...
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