So I have a 20 gallon tank, ammonia and nitrites are both 0 and nitrates are about 5 ppm or less. I have 6 false julii corys, a gold ram, 3 marimo balls, and an anubias. The Gold ram has a few white spots on his fins, so I'm pretty sure he has ich. I don't see any white spots on the corys yet though. I heard corys are sensitive to salt and many medications. I got Kordon Rid Ich Plus because it claims to be safer than most other meds, so I dosed the tank yesterday and today the corys seem much more lethargic, which worried me a lot. I did a 30% water change and now I don't know what to do. My LFS recommended Microbe-Lift Herbtana, which I had been using for a different purpose a week ago. But I'm wondering if there is still medication in the water is it safe to start Herbtana? I put my carbon filter back in to absorb the meds but don't know how long it takes to absorb and if my filter is even any good because it's been working for a while. Can anyone give me advice on this? I don't want to lose any fish.