Hi I was wondering if I am doing my treatment properly. So I'm going to start from the beginning I have a 47 gallon tank (I know that's weird) I have 6 tiger barbs, 4 small bala sharks (they will be transferred to a bigger tank when ready), as well as some algae eaters, and a asian water fern. I've noticed maybe 2 days ago that my bala sharks have a slight tint of red on their fins (pectoral and tail). I've seen this before with goldfish and it's quite deadly if not treated if I remember correctly. Hemorrhagic Septicemia? So I went to petsmart where I bought my fish and they weren't too helpful they told me that it was ammonia burn, but that's highly unlikely because ammonia would have to be present first of all (which it isn't) and it would have to be extremely high. So I went to Petco, which was a bit more helpful, one of the employees recommended PimaFix, and the description for it matches up with what i'm seeing with my bala sharks. So I bought it and tested it out earlier today. The directions said to take out any carbon filters if possible, and treat the tank daily for 7 days and on the 7th day do a 25-50% water change. I have a penguin 200 filter so it is possible to take out the carbon. But my concern is that isn't there beneficial bacteria on the padding that the fish need? I know that the bio wheel has some as well, but i'm not too sure what the carbon filter actually does other than detoxify chemicals, hence the reason why you can't have it in during treatment. So now that you got the whole back story does anyone know if i'm doing this right? Also how long can the fish survive without the carbon filter present? Any help is appreciated. Thanks. P.S I didn't know if I dump the PimaFix in the tank directly or if I put it in the filter to spit out. I went with putting it in the filter without the carbon pad. My logic was that if I put it in the filter it will mix it up more before dispersing it into the tank. Also when I put it in the PimaFix made the surface of the water very bubbly. Is that normal? My barbs thought it was food so they started "eating" the bubbles. Other Information: The tank has been set up for a month now I use Prime conditioner, and at times when the PH is too high mairneland PH regulator. My parameters for the water is all good accept maybe for the PH 7.8? But I know that the barbs and sharks can handle that.