With all those problems I have to mention that I lost all Zoas and Mushrooms. Not all but whatever is left all shrunk. I can't understand, my huge Sebae Anemone, 2 clams, Birds Nests, Duncans, Candy Canes, Chalices, Montiporas doing great..Aren't Zoas and Mushrooms one of the easiest to keep.....:'(:'(
how deep is you sand bed, a deep sand bed after 3 years is about done with its usefulness might start to siphon a little out each water change and start replacing it. I have started to do the same thing
That's not true. Sand is made out of calcium. How can it change composition?
if it's a coarse bed and is full of detritus, then that's another story, but there is nothing dangerous about a 3 year old sand bed.