I have another post in here about my sick Oscar that died, but am looking for a more specific answer. I've treated my tank twice with Parasite Guard over the past 72 hours and my question is how long do I leave the meds in there before I do a big water change and put carbon in my filters? I tried google and can't find an answer and it doesn't say on the instructions. All I could find was it's ok to add carbon to your filter 24 hours after your last treatment, but does that mean 24 hours is enough time to let the meds do their thing?