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:-\ Same thing happen to me. Drain some of the excess water and like some one else wrote bring back the salinity little by little. But what happen to me was that a snail climbed into the lever.
Have you been feeding them and if so what? I had an issue with an acan once where it receded from five polyps to one and all I started to do is feed the one polyp more. Over time it healed and the polyps started regrowing.
http://jdieck1.home.comcast.net/~jdieck1/chemcalc.html
Here is a web link that has helped me out. Also when you dose with two parts try to mix it with ro water before hand.