Planted Tank Enthusiast
Join Date: Nov 2008
Location: Morgan Hill, CA
I didn't want to do a water change because the medication instructions called for one dosing, and then wait 4 days before doing a water change in a second does. I said I was using Furan-2, which calls for daily dosing, but had actually switched to Tank Buddies Fungus Clear (some ingredients as Furan-2), which calls for a dosing every 4 days. I had a couple of days left in this 4 day dosing, and so it was easier to grab another cycled filter pad (and possibly have it get nuked by the medication) then to do a water change. I took the filter pad out after about 8 hours when the ammonia had cleared in hopes this would spare the pad getting wiped out by the medication (actually Pimafix, which I was also dosing) which was killing the n-bacteria, and this seems to have work. I kept it in some water with some ammonia (about 5ppm) during this time to help it recover (not a fish tank). Moving a filter pad from a hospital tank to another tank would be a really bad idea.
As for nitrates, heck, mine are already 40ppm+ out of the tap. If I have any fish that can't tolerate relatively high nitrates, they would have died long ago. Also, given the stocking in the hospital tank, nitrates wouldn't go up by more than a 1-2 ppm per week. Keep in mind with about 16 hours of no ammonia filtration, ammonia only went up to .10ppm, so this implies about 1ppm per week.
As for any other bad stuff accumulating, this tank has had more water changes the past 11 days than I care to count. Other than ammonia at the time (which is now resolved), nothing is accumulating it to levels which may be a concern.