03-03-2010, 03:19 PM
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Have you put carbon into your filter?
What medication did you use? Can you list the ingredients for me?
Some medications will stain the water, others have the ability to stain the glass, plastic, silicone seals, and anything else they touch. This is the reason its important to medicate in a quarantine tank whenever possible.
As for medicating all fish in the tank... that truly depends on what the problem is, what fish are in the tank, and what medication you are using. There is no one medication that is safe for all fish species... so when adding meds to a tank its important to be sure that all species of fish in the tank can handle the intended medication and all of the active ingredients in it.
If you can offer answers to the questions I asked maybe I can help you to get things cleared up.
As for staining in a plexiglass tank... typically once they are stained there is no way to remove the color from the plastic. To safely sterilize any fish tank, bleach water is the only safe way to do this. 1/4 cup of bleach to 1 gallon of water is the solution to mix. Wash the tank down with the bleach water, rinse until all odor of bleach is gone, and then let air dry for at least 48 - 2 hrs. Once dry, rinse again. If you still detect any odor of bleach, rinse thoroughly again and let air dry again. If you have he ability to let it sit in the sun during drying, even better.
Hope this helps.