Hi, kkmo...sorry about your fish...medications seem often to help US more than they do our fish....
To remove the meds. Get carbon to place in your filter for 24 hours...then remove the carbon. The discoloration should be gone.
Do you test your water for ammonia, nitrites and nitrates? If you don't I would suggest getting the API Master test kit for freshwater (liquid)...start testing your water, and charting the results....this will help you keep the water conditions for the fish healthier. Any time ammonia or nitrite are over 0 you need to do a 25-50% water change. I always do a 25-50% water change when my nitrates go up over 10....
High levels of nitrate can lead to many fish diseases...fin rot, pop eye, any of the bacterial infections that fish fall victim to when they are stressed. Often even the test kit instructions say 20 is "safe"...and that is essentially true...it in itself will not kill fish, like high ammonia or nitrite will.....BUT not being dead is only 1/2 of the equation...the true outcome we are looking for is a tank of healthy happy fish......Do water changes...
