is the water output at full open? that should lower the level in the skimmer internally. You may need to raise it higher BUT if this is just a temp thing you may not want to mess with it too much or it will skim like crap once the meds leave the system.
May want to just turn it off and just do water changes daily - though that might dilute the medication. I have never treated for ich so i dont know if the instructions advise AGAINST water changes...
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