I've been searching for info about using Colloidal Silver in the tank. My fish was so much better after just one treatment; however, I would like to know (from those who have used this form of medication) if having the charcoal in the filter would deactivate the Colloidal Silver. In my 38 gallon tank, I use a Fluval 70 and a large Whisper filter. I have nothing in the filters right now except for the sponge in the Fluval and the empty filter floss bag in the Whisper. I want the sick fish to get the full benefit of the C.S. but I'm also a little concerned about not having the carbon in there as well as the bag of ammonia pellets in the Fluval.