11-14-2012, 12:43 PM
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I am no expert on fish disease or treatments, far from it, but one thing I have learned the hard way--by losing half a tank of rare fish--is to be very careful with medications. Regardless of what any manufacturer tells you, be they Seachem or API or Kordon, whomever, not all fish can tolerate these medications.
I've forgotten the specific product you (Matt) mentioned, but I recall I had misgivings with the loaches.
And I would suggest that it is more likely to be the treatment rather than ich that is causing the fish deaths now. Ich has to be very bad before fish will die so soon from it. When I have lost fish to ich, they have literally been covered with spots.
Ich is always present in our tanks, always. It breaks out when the fish become stressed. Normally, they can fight it off. Adding any medication to a tank is stressful, another reason why one has to be very careful with treatments.
If I were in this situation, I would do a major water change using warmer water, and get the temp up to 85F.