Urchins Dying?

[adidas]

Originally Posted by Beverly

Don't you have ammonia in your tank? How much ammonia did you find today?

im not sure, one test says its ok, and the other says 0.30ppm. I did find out my salinuty was very low. just did a 45g water change. sad thing, my little unicorn tang is dying, he is in a quarrintine tank but i'm not sure he'll pull through. also, my big powder blue tang is swimming on its side a bit now. I don't know what to do!