Cory With No Face!

[xamy_valox]

I already have carbon in my filter as I have had it in for a few months and was told by users of this forum that there was no real need to remove it.

I did around a 60% water change yesterday and will do another 60% one tomorrow as well before adding anymore medication.

I am hoping he is on the mend. I seem to change my mind day after day, or depending on what light he is in haha, but today it does look like where the hole is, there is new tissue growing, and kind plugging the gap? Knowing me, tomorrow I'll be panicking thinking he is on deaths door but we shall see!!!

 

[eaglesaquarium]

You are going to need NEW carbon to remove the meds from the tank, before switching medication.  The reason that you were told you could leave the carbon in was that it was done ADsorbing chemicals from the water, and was just a surface for bacteria to colonize.  But, now that you need to remove the meds, carbon is ESSENTIAL, and you need NEW carbon to do so.  I'd do a large water change, roughly 50-75%, and then put the carbon into the filter to take out the rest of the meds... Give it a few days to clear, before taking the carbon out (and discard, as it may or may not be used up) and dosing the new meds.  At the end of the new meds cycle, do another massive water change, and add NEW carbon again to remove the leftover meds.   Then after a week or so, take out the carbon once more, and refill the filter with another media of some sort. 
 
 
(Keep an eye on your ammonia and nitrite numbers as the carbon you are taking out is a home to a bit of BB and you may have a minor spike - or may not.  I'd suggest not feeding for a day or so after removing the carbon to keep the ammonia levels lower for a bit.)