11-13-2009, 08:31 PM
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I do use tap water, but I always have. We have 8 tanks and it doesn't affect them all, so it can't be the water. It only affects the tanks that contain my Oscars. I use the same water conditioner on all of my tanks.
I have actually "googled" pink aquarium water, and have found a few others who have had a similar experience. However, most of what I have found is others like me posing the question. I haven't found anyone with an explanation. :o(
I am wondering if it is some type of bacterial bloom, as it comes so close to a water change and leaves soon after. The water doesn't get cloudy, just slightly pink.