I bought a Coral Life airstone (technically airwood, I suppose) which produces very fine bubbles. However, after about 3-4 days, it started to darken and become black all over. I took it out after seeing it. Can someone tell me what happened?
Here are pics:
http://i221.photobucket.com/albums/dd154/Klern/DSC04257.jpg
http://i221.photobucket.com/albums/dd154/Klern/DSC04258.jpg
http://i221.photobucket.com/albums/dd154/Klern/DSC04259.jpg
Sorry for the blur.
Here are pics:
http://i221.photobucket.com/albums/dd154/Klern/DSC04257.jpg
http://i221.photobucket.com/albums/dd154/Klern/DSC04258.jpg
http://i221.photobucket.com/albums/dd154/Klern/DSC04259.jpg
Sorry for the blur.