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Have you tried using Excel? You don't need to go crazy with the dosage even if you have a bad infestation - it will just take longer to clear if you use smaller dosages.
Also, do you use a specific reference solution for your CO2 checker or just tap water?
Ever since I added pressurised CO2 i've been plagued with surface scum. I have a 180L Juwel tank which runs with both its original internal filter coupled with an exteral eheim 2324 so I'd be really surprised if this problem has anything to do with filtration. I use EI dosing and do weekly 50%...
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